Auto merge of #56572 - kevgrasso:let_self_err_dev, r=estebank

Contexually dependent error message for E0424 when value is assigned to "self"

This is an improvement for pull request #54495 referencing issue #54369. If the "self" keyword is assigned a value as though it were a valid identifier, it will now report:
```
let self = "self";
    ^^^^ `self` value is a keyword and may not be bound to variables or shadowed
```
instead of
```
let self = "self";
    ^^^^ `self` value is a keyword only available in methods with `self` parameter
```
If anyone has a better idea for what the error should be I'd be happy to modify it appropriately.

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