Unlock on Merge branch check improvements

[GrantBirki]

This pull request does the following:

• Checks for lock branches before checking for lock files. This is the default behavior else where, so the same should be done in the "unlock on merge" workflow
• Adds colored logs to the "unlock on merge" workflow to make it easier to read

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

src/functions/unlock-on-merge.js:41

• [nitpick] The error message 'no lock branch found' should be more descriptive to provide better context, e.g., 'No lock branch found for the specified environment.'

core.info(`⏩ no lock branch found for environment ${COLORS.highlight}${environment}${COLORS.reset} - skipping...`)

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