Auto merge of #11094 - y21:issue11084, r=Alexendoo

[`useless_vec`]: add more tests and don't lint inside of macros

Closes #11084.

I realized that the fix I added in #11081 itself also causes an error in a suggestion when inside of a macro. Example:
```rs
macro_rules! x {
  () => {
    for _ in vec![1, 2] {}
  }
}
x!();
```
Here it would suggest replacing `vec![1, 2]` with `[x!()]`, because that's what the source callsite is (reminder: it does this to get the correct span of `x!()` for code like `for _ in vec![x!()]`), but that's wrong when *inside* macros, so I decided to make it not lint if the whole loop construct is inside a macro to avoid this issue.

changelog: [`useless_vec`]: add more tests and don't lint inside of macros

r? `@Alexendoo` since these were your tests, I figured it makes most sense to assign you

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