Rollup merge of #69211 - petrochenkov:prevtok, r=Centril
parser: Simplify treatment of macro variables in `Parser::bump`
Follow-up to https://github.com/rust-lang/rust/pull/69006.
Token normalization for `$ident` and `$lifetime` is merged directly into `bump`.
Special "unknown macro variable" diagnostic for unexpected `$`s is removed as preventing legal code from compiling (as a result `bump` also doesn't call itself recursively anymore and can't make `prev_token` inconsistent).
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