feat(client/v2): improve error message on enums (backport #21936)

[mergify]

Description

This PR improves AutoCLI by printing the possible enum values when an invalid input is provided, otherwise users don't know what is valid.

Closes: #XXXX

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Summary by CodeRabbit

• New Features

  • Enhanced error handling for invalid input in the Set method, providing users with a list of valid enum values in error messages.

• Documentation

  • Updated changelog to include improvements in error reporting for invalid inputs, enhancing user feedback.

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This is an automatic backport of pull request #21936 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of dc2cea5 has failed:

On branch mergify/bp/release/v0.50.x/pr-21936
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit dc2cea5bc.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   client/v2/autocli/flag/enum.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   client/v2/CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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