:seedling: Add validation for PREVIOUS_RELEASE_TAG in release-notes-tool

[tsuzu]

trafficstars

What this PR does / why we need it: Add a validation logic for make release-notes

✅ Now Accepts:

• tags/v1.0.0-alpha.1 (alpha pre-release)
• tags/v1.0.0-beta.1 (beta pre-release)
• tags/v1.0.0-rc.1 (release candidate)

❌ Now Rejects:

• v1.0.0-alpha.1 (missing tags/ prefix)
• tags/v1.0.0 (no pre-release identifier)
• tags/v1.0.0-dev.1 (unsupported pre-release type)
• invalid-version (malformed version)

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #12278

/area release

[tsuzu]

@chandankumar4 Is this a change you are expecting? I appreciate it if you review this PR. Thanks!

[tsuzu]

/retest

[sivchari]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 73279cb64ee7f62263e788e108c8a03acd45214b

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: b05a81d873f975ee74d3dd1511f4b7d5b0fd1592

[tsuzu]

/retest

[tsuzu]

/retest

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 66fcd30dda4a5f40184e79bd834de9455d67f36b

[chandankumar4]

/lgtm

[sbueringer]

Thank you!

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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