Add squash commits support for "All protected branches" rule and wildcard branch rules
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### Proposal
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Currently, the squash commits feature for branch rules is available for:
- "All branches" rule
- Individual "Protected branch" rules
However, it is not available for the "All protected branches" rule and wildcard branch rules.
This was [omitted](https://gitlab.com/groups/gitlab-org/-/epics/15526#note_2249293686) from the initial implementation but should be added for feature completeness.
This issue proposes to add squash commits configuration support for these types of rules.
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