[DOCS] Refactor book-scoped variables in docs/reference/index.asciidoc (#107413)

* Remove `es-test-dir` book-scoped variable

* Remove `plugins-examples-dir` book-scoped variable

* Remove `:dependencies-dir:` and `:xes-repo-dir:` book-scoped variables

- In `index.asciidoc`, two variables (`:dependencies-dir:` and `:xes-repo-dir:`) were removed.
- In `sql/index.asciidoc`, the `:sql-tests:` path was updated to fuller path
- In `esql/index.asciidoc`, the `:esql-tests:` path was updated idem

* Replace `es-repo-dir` with `es-ref-dir`

* Move `:include-xpack: true` to few files that use it, remove from index.asciidoc

docs/reference/ccr/apis/auto-follow/delete-auto-follow-pattern.asciidoc

@@ -57,7 +57,7 @@ This API deletes a configured collection of
 [[ccr-delete-auto-follow-pattern-query-params]]
 ==== {api-query-parms-title}
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [[ccr-delete-auto-follow-pattern-examples]]
 ==== {api-examples-title}

docs/reference/ccr/apis/auto-follow/get-auto-follow-pattern.asciidoc

@@ -75,7 +75,7 @@ This API will return the specified auto-follow pattern collection.
 [[ccr-get-auto-follow-pattern-query-params]]
 ==== {api-query-parms-title}
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [[ccr-get-auto-follow-pattern-examples]]
 ==== {api-examples-title}

docs/reference/ccr/apis/auto-follow/pause-auto-follow-pattern.asciidoc

@@ -43,7 +43,7 @@ meantime.
 [[ccr-pause-auto-follow-pattern-query-params]]
 ==== {api-query-parms-title}
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [[ccr-pause-auto-follow-pattern-examples]]
 ==== {api-examples-title}

docs/reference/ccr/apis/auto-follow/put-auto-follow-pattern.asciidoc

@@ -74,7 +74,7 @@ the new patterns.
 [[ccr-put-auto-follow-pattern-query-params]]
 ==== {api-query-parms-title}
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [[ccr-put-auto-follow-pattern-request-body]]
 ==== {api-request-body-title}

docs/reference/ccr/apis/auto-follow/resume-auto-follow-pattern.asciidoc

@@ -38,7 +38,7 @@ have been deleted or closed in the meantime.
 [[ccr-resume-auto-follow-pattern-query-params]]
 ==== {api-query-parms-title}
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [[ccr-resume-auto-follow-pattern-examples]]
 ==== {api-examples-title}

docs/reference/ccr/apis/follow/get-follow-info.asciidoc

@@ -52,7 +52,7 @@ replication options and whether the follower indices are active or paused.
 [[ccr-get-follow-info-query-params]]
 ==== {api-query-parms-title}
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [role="child_attributes"]
 [[ccr-get-follow-info-response-body]]

docs/reference/ccr/apis/follow/post-pause-follow.asciidoc

@@ -56,7 +56,7 @@ following task.
 [[ccr-post-pause-follow-query-params]]
 ==== {api-query-parms-title}
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [[ccr-post-pause-follow-examples]]
 ==== {api-examples-title}

docs/reference/ccr/apis/follow/post-resume-follow.asciidoc

@@ -69,7 +69,7 @@ returns, the follower index will resume fetching operations from the leader inde
 [[ccr-post-resume-follow-query-params]]
 ==== {api-query-parms-title}
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [[ccr-post-resume-follow-request-body]]
 ==== {api-request-body-title}

docs/reference/ccr/apis/follow/post-unfollow.asciidoc

@@ -63,7 +63,7 @@ irreversible operation.
 [[ccr-post-unfollow-query-params]]
 ==== {api-query-parms-title}
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [[ccr-post-unfollow-examples]]
 ==== {api-examples-title}

docs/reference/ccr/apis/follow/put-follow.asciidoc

@@ -65,7 +65,7 @@ referenced leader index. When this API returns, the follower index exists, and
   follower shard requires transferring all the remote Lucene segment files to
   the follower index.
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [[ccr-put-follow-request-body]]
 ==== {api-request-body-title}

docs/reference/ccr/apis/get-ccr-stats.asciidoc

@@ -56,7 +56,7 @@ shard-level stats as in the <<ccr-get-follow-stats,get follower stats API>>.
 `timeout`::
 (Optional, time) Controls the amount of time to wait for results. Defaults to unlimited.
 
-include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
+include::{es-ref-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 
 [role="child_attributes"]
 [[ccr-get-stats-response-body]]

docs/reference/ccr/getting-started.asciidoc

@@ -159,7 +159,7 @@ cluster with cluster alias `leader`.
     connected to.
 ====
 
-include::{es-repo-dir}/security/authentication/remote-clusters-privileges-cert.asciidoc[tag=configure-ccr-privileges]
+include::{es-ref-dir}/security/authentication/remote-clusters-privileges-cert.asciidoc[tag=configure-ccr-privileges]
 
 [[ccr-getting-started-follower-index]]
 ==== Create a follower index to replicate a specific index