Replace SHA tooltips with copy buttons in submodule diffs #18124
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xref. https://github.com/github/accessibility-audits/issues/7023
Description
This PR replaces the full SHA tooltips of submodule diffs with copy buttons just like we have in the expandable commit summary.
Screenshots
Release notes
Notes: [Fixed] Copying commit SHAs from submodule diffs is keyboard accessible