reworks condition for matching chromium build trigger label (elastic#220545)

## Summary

One more try, this time with single line expression 🤷🏾‍♂️ ... whilst
using only the contains function, [see here for more
information](https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/evaluate-expressions-in-workflows-and-actions#contains)

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Author: eokoneyo

.github/workflows/trigger-chromium-build.yml

@@ -10,9 +10,7 @@ permissions:
 
 jobs:
   matches_label:
-    if: |
-      contains(github.event.issue.labels.*.name, 'trigger-chromium-build') 
-      && (github.event.issue.author_association == 'MEMBER' || github.event.issue.author_association == 'COLLABORATOR')
+    if: ${{ contains(github.event.issue.labels.*.name, 'trigger-chromium-build') && contains(fromJSON('["MEMBER", "COLLABORATOR"]'), github.event.issue.author_association) }}
     runs-on: ubuntu-latest
     outputs:
       version_bump_config: ${{ steps.extract_version_bump_config.outputs.result }}