Add namespace_selector to pod's affinities

[artemvang]

Description

This change adds new attribute namespace_selector to the kubernetes_pod resource (affinities section).
See #1826.

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

...

References

Community Note

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[hashicorp-cla]

All committers have signed the CLA.

[BBBmau]

Hello! Thank you for opening this PR @artemvang. Could you also add some tests for the namespace_selector attribute as well?

[Nox-404]

Hello,
any update on this ?

[BBBmau]

@artemvang pinging to know if you're still interested in contributing with this PR. It would be a great addition. Only thing missing is a test that checks for the namespace_selector attribute. You can reference how other attributes are checked within other resources in the repo.