[8.8](backport #35605) [filebeat][gcs] Fix for concurrency issues and context timeouts in the GCS input

[mergify]

This is an automatic backport of pull request #35605 done by Mergify.

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[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

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• Start Time: 2023-06-09T04:42:24.504+0000

• Duration: 52 min 3 sec

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[mergify]

This pull request has not been merged yet. Could you please review and merge it @ShourieG? 🙏

[ShourieG]

need to wait till 8.8.1 release before merging this backport

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.8/pr-35605 upstream/mergify/bp/8.8/pr-35605
git merge upstream/8.8
git push upstream mergify/bp/8.8/pr-35605

[ShourieG]

/test