[7.x](backport #27045) Preserve annotations in a kubernetes namespace metadata

[mergify]

This is an automatic backport of pull request #27045 done by Mergify.

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[elasticmachine]

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• Start Time: 2021-07-27T10:43:10.762+0000

• Duration: 111 min 22 sec

• Commit: 328f5f6

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Test	Results
Failed	0
Passed	32224
Skipped	3900
Total	36124

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Test stats 🧪

Test	Results
Failed	0
Passed	32224
Skipped	3900
Total	36124

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/test

[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/7.x/pr-27045 upstream/mergify/bp/7.x/pr-27045
git merge upstream/7.x
git push upstream mergify/bp/7.x/pr-27045