refactor: mrutils.getMRForBranch & mrutils.mrOptions

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Description

• refactor: mrutils.getMRForBranch & mrutils.mrOptions

Comes from this discussion: !2058 (comment 2462668609)

Related Issues

Relates to #7438 (closed)

How has this been tested?

Tests are in place. This is only a refactor.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)
• Test gap