fix: Preserve language in cell actions undo/redo stack

[wasimsandhu]

📝 Summary

Fixes #2509.

🔍 Description of Changes

Added language: LanguageAdapterType to state.history, and use this in deleteCell and undoDeleteCell handlers to bring back SQL/Markdown cells appropriately.

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

📜 Reviewers

@akshayka OR @mscolnick

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[mscolnick]

I think we should just always pass back the python code to the undo stack, instead of add additional language adapter. It should be a one line change.