[packages] migrate all plugins to packages (#148130)

Fixes https://github.com/elastic/kibana/issues/149344

This PR migrates all plugins to packages automatically. It does this
using `node scripts/lint_packages` to automatically migrate
`kibana.json` files to `kibana.jsonc` files. By doing this automatically
we can simplify many build and testing procedures to only support
packages, and not both "packages" and "synthetic packages" (basically
pointers to plugins).

The majority of changes are in operations related code, so we'll be
having operations review this before marking it ready for review. The
vast majority of the code owners are simply pinged because we deleted
all `kibana.json` files and replaced them with `kibana.jsonc` files, so
we plan on leaving the PR ready-for-review for about 24 hours before
merging (after feature freeze), assuming we don't have any blockers
(especially from @elastic/kibana-core since there are a few core
specific changes, though the majority were handled in #149370).

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

packages/kbn-datemath/package.json

@@ -1,8 +1,8 @@
 {
   "name": "@kbn/datemath",
-  "version": "5.0.4",
+  "version": "1.0.0",
   "description": "elasticsearch datemath parser, used in kibana",
-  "license": "Apache-2.0",
+  "license": "SSPL-1.0 OR Elastic License 2.0",
   "peerDependencies": {
     "moment": "^2.24.0"
   }