devops: make sure uploaded reports always contain directory (#29080)

* Before the change if if uploaded artifact path contained just one file
it would be [archived
directly](694cdabd8b/src/search.ts (L142-L151)),
but if there is a sister folder it would be an archive of the entire
dir. According to the action docs "If a wildcard pattern is used, the
path hierarchy will be preserved after the first wildcard pattern", so
hopefully it means that the directory is always compressed even if there
is a single file in it.
* Use `overwrite: true` to have only one artifact with pull request
number.

.github/actions/upload-blob-report/action.yml

@@ -19,7 +19,7 @@ runs:
       uses: actions/upload-artifact@v4
       with:
         name: blob-report-${{ inputs.job_name }}
-        path: ${{ inputs.report_dir }}
+        path: ${{ inputs.report_dir }}/**
         retention-days: 7
     - name: Write triggering pull request number in a file
       if: always() && github.event_name == 'pull_request'
@@ -29,5 +29,6 @@ runs:
       if: always() && github.event_name == 'pull_request'
       uses: actions/upload-artifact@v4
       with:
-        name: pull-request-${{ inputs.job_name }}
-        path: pull_request_number.txt
+        name: pull-request-number
+        path: pull_request_number.txt
+        overwrite: true

.github/workflows/create_test_report.yml

@@ -49,7 +49,7 @@ jobs:
     - name: Read pull request number
       uses: ./.github/actions/download-artifact
       with:
-        namePrefix: 'pull-request'
+        namePrefix: 'pull-request-number'
         path: '.'
 
     - name: Comment on PR