forEachToken: correctly handle JSDocTag

[ajafff]

Fixes #28331

• handle JSDocTag and JSDocClassTag
• visit atToken and tagName in existing tags' handling
• visiting children of JSDocTypeLiteral didn't return early if callback returned truthy value
• fix codefix for deleting unused identifier

There are still some test failures. All of them have to do with completions in JS files. I don't know how to debug this. It seems like the tagName is treated like an declaration somewhere in the binder or checker (I tried returning early in bindWorker if passed a tagName but that didn't fix the failures...

Tagging @Andy-MS for some guidance on how to fix the remaining test failures

[ghost]

@ajafff Please take a look at #28376 which will conflict with this.

[ajafff]

@Andy-MS that's fine, I'll update this PR after that other one is merged.

There's still the need for the other changes I made. And there's still the question of how to fix the tests

[ghost]

OK, please merge from master then I'll look at the tests.

[ghost]

Made a PR to fix the tests: ajafff#1