[release/0.5] Only apply latest tag to container if it is the latest stable tag

[samdoran]

Description

Backport of #1921 and #1924 for Lightspeed Stack 0.5.

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up service version
• Bump-up dependent library
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change
• Unit tests improvement
• Integration tests improvement
• End to end tests improvement
• Benchmarks improvement

Tools used to create PR

Identify any AI code assistants used in this PR (for transparency and review context)

• Just me

Related Tickets & Documents

• Backport of LCORE- Only apply latest tag to container if it is the latest stable tag #1921
• Backport of LCORE- Fold and strip tag value in build_image step #1924

Checklist before requesting a review

• I have performed a self-review of my code.
• PR has passed all pre-merge test jobs.
• If it is a core feature, I have added thorough tests.

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[samdoran]

I can fixup the pydocstyle failures if we want. I wonder if the rules are out of sync with main since this doesn't fail in main or release/0.4.

[tisnik]

LGTM