feature(xtask): git integration for formatter codegen

[leops]

Summary

This is a followup to #2031 and QoL improvement related to #1997:

• It removes the now-unused migration code from the old folder structure to the new
• The formatter codegen is now integrated with git and will automatically stage modified files, as well as avoid to overwrite files that have uncommitted modifications by default (can be overridden with the --allow-staged and --allow-dirty CLI flags)
• Rust files that are no longer imported into the auto-generated module tree are now automatically removed

[github-actions]

Parser conformance results on ubuntu-latest

T262

Test result	main count	This PR count	Difference
Total	45250	45250	0
Passed	44130	44130	0
Failed	1120	1120	0
Panics	0	0	0
Coverage	97.52%	97.52%	0.00%

TS

Test result	main count	This PR count	Difference
Total	15976	15976	0
Passed	11920	11920	0
Failed	4056	4056	0
Panics	0	0	0
Coverage	74.61%	74.61%	0.00%

[ematipico]

In Rome classic we had already something to deal with repos: https://github.com/rome/tools/blob/archived-js/internal/vcs/index.ts

And our CLI had a --allow-dirty when using format or lint or other commands. I think we can safely create a new crate called rome_vsc and have your new code moved there.

This will be useful for cases like: running rome auto-config

[MichaReiser]

In Rome classic we had already something to deal with repos: https://github.com/rome/tools/blob/archived-js/internal/vcs/index.ts

And our CLI had a --allow-dirty when using format or lint or other commands. I think we can safely create a new crate called rome_vsc and have your new code moved there.

This will be useful for cases like: running rome auto-config

I recommend moving the code once it is needed because that would also require better error handling that isn't required for the codegen use case.

Thanks @leops for these improvements. I love that it now detects no longer needed fails. I always had to be extra careful when changing the AST to make sure I delete any no longer needed files manually. That was hard, my brain isn't good at these kind of tasks :D