feat: added name validation scheme as a config field and flag as well

[av153k]

What this PR does:

• Adds name_validation_scheme as yaml flag and name.validation.scheme as a flag
• Remove config init and set the model.NameValidationScheme directly in New() method to creating a Cortex object

Which issue(s) this PR fixes:
Fixes #6702

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[av153k]

I am working on the tests for this.

[av153k]

Added test for name validation scheme in TestConfigValidation in cortex_test.go

[yeya24]

Thanks @av153k. Great work and I think it is on the right track. Just few comments

[yeya24]

Can you also update changelog?

[av153k]

Can you also update changelog?

What would be the version of this change, though?

[yeya24]

This needs to be returned

[av153k]

Okay. I will add that. Anything else apart from this? Also after this is done, can you please point me to a few issues that you think I can take up on. Thank you.

[av153k]

There was some issue with the generated doc I guess. Will switch to WSL since I am using windows and then push one more commit with generated docs.

[yeya24]

Please fix lint and unit test. You can also run those tests locally and see if they are able to pass

[av153k]

Please fix lint and unit test. You can also run those tests locally and see if they are able to pass

I had to add back the validation check in the config.validate() for name validation scheme. I though about removing that specific test but felt its much better to add the validation logic.

I am working on the lint issues.

[av153k]

@yeya24 Do I have to add the test for race cases or will that be in a separate PR?

[av153k]

I am trying make doc to generate the docs and fix the lint issue but I am getting hit with some qemu arch related error. Any help? @yeya24

Actually now, just stuck here.