Merge and refactor build pipelines

Merge Request

Breaking Changes

none

Description

• Merge pipelines from backend and frontend repository
• Separate pipelines for feature branches, develop and main
• Build pipeline triggered by *-release tags is now part of merge to main branch

Screenshot

Checklist

• The code compiles without any warnings.
• I followed the code review checklist.
• The documentation has been added/updated.
• There are no System.out.println() statements.
• package-lock.json was not changed unless I added or edited dependencies.

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