Refactor workflow concurrency group and consolidate branch validation

[Copilot]

• Resolves: Change trigger branch. Add RC #201 (code review feedback)

Summary

Improves GitHub Actions workflow maintainability by refactoring complex branch matching logic into more readable formats and consolidating duplicated validation patterns.

Concurrency group refactoring:

• Reformatted single-line expression into multi-line structure with clear logical grouping
• Used contains(fromJson()) for exact branch matching, startsWith() for pattern matching

Branch validation consolidation:

• Replaced three separate branch conditions with single regex pattern: '^(ionos-dev|ionos-stable)$|^rc/.*$'
• Reduces duplication across lines 54, 147-149, 686, 929 (bash validation only)

Before:

if [ "${{ github.ref_name }}" != "ionos-dev" ] && \
   [ "${{ github.ref_name }}" != "ionos-stable" ] && \
   [[ ! "${{ github.ref_name }}" =~ ^rc/ ]]; then

After:

VALID_BRANCH_PATTERN='^(ionos-dev|ionos-stable)$|^rc/.*$'
if [[ ! "${{ github.ref_name }}" =~ $VALID_BRANCH_PATTERN ]]; then

TODO

• Refactor concurrency group for readability
• Consolidate branch validation logic
• Validate workflow syntax

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

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