Add not dedoted k8s pod labels in autodiscover provider to be used for templating, exactly like annotations

[MichaelKatsoulis]

What does this PR do?

Continuation of https://github.com/elastic/elastic-agent/pull/1398 for kubernetes autodiscover provider used in beats.

Why is it important?

Checklist

• [ ] My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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• [ ]

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[mergify[bot]]

This pull request does not have a backport label. If this is a bug or security fix, could you label this PR @MichaelKatsoulis? 🙏. For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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• Start Time: 2022-10-10T13:14:07.592+0000

• Duration: 115 min 5 sec

Test stats :test_tube:

Test	Results
Failed	0
Passed	23636
Skipped	1950
Total	25586

:green_heart: Flaky test report

Tests succeeded.

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[MichaelKatsoulis]

I need to fix the tests first!