Rollup merge of #90544 - ehuss:demote-locator-warn, r=petrochenkov

Demote metadata load warning to "info".

There is a warn log message for whenever the crate loader fails to load metadata from a candidate file. I think this warning is too aggressive, as there are several situations where metadata information might not be found in a candidate file, which is normal. Also, this warning is somewhat confusing, and non-actionable in most cases for a user (most users will not know what it means).

If the crate loader ultimately does not find a valid crate, then an error will be reported (and hopefully #88368 will improve that error message).

If a rustc developer wants to debug a loader problem, they can still use `RUSTC_LOG=rustc_metadata=debug` and get the details.

There is more discussion of this particular warning at https://github.com/rust-lang/rust/issues/89795#issuecomment-940798190.

Fixes #90525

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