narrow paths to trigger (server|webapp)-ci (#33678)

* Consolidate server and webapp CI workflows into single templates

- Merge server-ci-master.yml and server-ci-pr.yml into server-ci-template.yml
- Merge webapp-ci-master.yml and webapp-ci-pr.yml into webapp-ci-template.yml
- Add conditional concurrency control for PRs only
- Maintain all existing behavior while eliminating duplication

* narrow paths to trigger (server|webapp)-ci

.github/workflows/server-ci.yml

@@ -8,7 +8,9 @@ on:
     paths:
       - "server/**"
       - "e2e-tests/**"
-      - ".github/**"
+      - ".github/workflows/server-ci.yml"
+      - ".github/workflows/server-test-template.yml"
+      - ".github/workflows/mmctl-test-template.yml"
 
 concurrency:
   group: ${{ github.event_name == 'pull_request' && format('{0}-{1}', github.workflow, github.ref) || '' }}

.github/workflows/webapp-ci.yml

@@ -8,6 +8,8 @@ on:
     paths:
       - "webapp/**"
       - "e2e-tests/**"
+      - ".github/workflows/webapp-ci.yml"
+      - ".github/actions/webapp-setup/**"
 
 concurrency:
   group: ${{ github.event_name == 'pull_request' && format('{0}-{1}', github.workflow, github.ref) || '' }}