[DX-3571] ci: update version alpha

[nattb8]

Summary

This PR updates the GitHub Actions workflow to include a new "Mark as alpha release" checkbox. When selected, the updated version will have the .alpha suffix unless it already exists.

• Added a mark_as_alpha input (boolean checkbox).
• Adjusted version bumping logic:
  • If not marked as alpha, .alpha is removed if present.
  • If marked as alpha, .alpha is added if not already present.
• Ensured correct version increments for both patch and minor updates.

Example:

Current Version	Upgrade Type	Mark as Alpha	New Version
1.3.0.alpha	Patch	No	1.3.0
1.3.0.alpha	Minor	No	1.4.0
1.3.0	Patch	No	1.3.1
1.3.0	Minor	No	1.4.0
1.3.0.alpha	Patch	Yes	1.3.1.alpha
1.3.0.alpha	Minor	Yes	1.4.0.alpha
1.3.0	Patch	Yes	1.3.1.alpha
1.3.0	Minor	Yes	1.4.0.alpha