Override squash settings with option to specify different overrides based on the source branch

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Merge Request Squash Settings per protected bra... (#290042 - closed) implements the ability to define squash commit when merging overrides for a protected branch. This allows the user to define what happens when we merge into the protected branch. However, the issue also describes a situation where a protected branch should have different overrides based on which branch is being merged into the protected branch

• I need to be able to merge between protected branches (even though I require squash from non-protected to protected branches) - which is a possibly-separate requirement captured in #24452
  • because squashing between protected branches almost never makes sense (and merges between protected branches are a common thing in eg gitflow). the only time we should require squashing, is when merging from a non-protected branch to a protected branch

When the original issue has been implemented we might want to iterate and add a new mechanism to give even finer control