Auto merge of #106195 - Nilstrieb:no-more-being-clueless-whether-it-really-is-a-literal, r=compiler-errors

Improve heuristics whether `format_args` string is a source literal

Previously, it only checked whether there was _a_ literal at the span of the first argument, not whether the literal actually matched up. This caused issues when a proc macro was generating a different literal with the same span.

This requires an annoying special case for literals ending in `\n` because otherwise `println` wouldn't give detailed diagnostics anymore which would be bad.

Fixes #106191

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