[flynt] Do not offer a fix when the new string is too long (FLY002)

[InSyncWithFoo]

Summary

Resolves #5150.

Test Plan

cargo nextest run and cargo insta test.

[InSyncWithFoo]

This is just a workaround rather than a proper fix, since I'm not sure how to make the generator generate multiline, dedented strings.

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

[MichaReiser]

Hm I think we actually stopped the practice of not offering a fix if the resulting expression becomes too long. The only exception to this are some of the simplify rules because the expression length is considered an approximation for "simplyfing".

So I think we should simply close the issue instead and hint users towards suppressing the rule in this particular case.

But I must admit I can see some argument for respecting the line length, at least when targeting pre Python 3.12.