feat(eslint-plugin): no-unsafe-enum-comparison handles switch cases

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes [no-unsafe-enum-comparison] consider evaluating switch statements #7509
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

Recreates #7541. Description pasted following.

Currently, the no-unsafe-enum-comparison rule handles comparisons (e.g. BinaryExpression) but it does not handle switch statements. My PR makes the rule handle both.

This was an oversight in my original design of this rule, and I consider this to be a bug. However, I have marked the PR as feat instead of fix to be more conservative; feel free to change it if you wish.

Code Change Summary

I refactored the logic in the BinaryExpression selector and put it inside of a function called isMismatchedComparison.
Then, I can call that function from multiple selectors. The changes should be pretty straightforward to understand.

Other Notes

I have reworked the documentation for this rule a bit, as the original text is now no longer accurate, because TypeScript has made number enums more safe in version 5.0. Thus, I rewrote the document to focus on the string case, adding a line to emphasize that the rule is still useful if you choose to use string enums over number enums.

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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