[9.0] [SLOs] Fix path for slo e2e test scope !! (#214137) (#214211)

# Backport

This will backport the following commits from `main` to `9.0`:
- [[SLOs] Fix path for slo e2e test scope !!
(#214137)](https://github.com/elastic/kibana/pull/214137)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT
[{"author":{"name":"Shahzad","email":"shahzad31comp@gmail.com"},"sourceCommit":{"committedDate":"2025-03-12T15:52:42Z","message":"[SLOs]
Fix path for slo e2e test scope !! (#214137)\n\n## Summary\n\nSince
observability plugins have been moved, needed to fix the path to\nscope
tests
!!","sha":"82a6be90164571f5fab8372d75705dd5bcd315dc","branchLabelMapping":{"^v9.1.0$":"main","^v8.19.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","v9.0.0","backport:version","ci:synthetics-runner-suites","v9.1.0","v8.19.0"],"title":"[SLOs]
Fix path for slo e2e test scope
!!","number":214137,"url":"https://github.com/elastic/kibana/pull/214137","mergeCommit":{"message":"[SLOs]
Fix path for slo e2e test scope !! (#214137)\n\n## Summary\n\nSince
observability plugins have been moved, needed to fix the path to\nscope
tests
!!","sha":"82a6be90164571f5fab8372d75705dd5bcd315dc"}},"sourceBranch":"main","suggestedTargetBranches":["9.0","8.x"],"targetPullRequestStates":[{"branch":"9.0","label":"v9.0.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v9.1.0","branchLabelMappingKey":"^v9.1.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/214137","number":214137,"mergeCommit":{"message":"[SLOs]
Fix path for slo e2e test scope !! (#214137)\n\n## Summary\n\nSince
observability plugins have been moved, needed to fix the path to\nscope
tests
!!","sha":"82a6be90164571f5fab8372d75705dd5bcd315dc"}},{"branch":"8.x","label":"v8.19.0","branchLabelMappingKey":"^v8.19.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Shahzad <shahzad31comp@gmail.com>

.buildkite/scripts/pipelines/pull_request/pipeline.ts

@@ -156,7 +156,7 @@ const getPipeline = (filename: string, removeSteps = true) => {
 
     if (
       (await doAnyChangesMatch([
-        /^x-pack\/plugins\/observability_solution/,
+        /^x-pack\/solutions\/observability\/plugins/,
         /^package.json/,
         /^yarn.lock/,
       ])) ||