Sqlx type info crash

[lovasoa]

Prevent panic in mismatched_types error construction for Any database by avoiding Type::type_info() call.

The mismatched_types error path would panic when DB was Any because Type<Any>::type_info() is intentionally unimplemented!(). This change introduces a helper function to check if the database is Any and, if so, returns "<unknown>" for the Rust SQL type instead of calling the panicking type_info(). A regression test is added to confirm the fix.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}

[lovasoa]

@cursoragent ensure no clippy warnings, whatever the selected feature set:

   Compiling sqlx-core-oldapi v0.6.51 (/home/runner/work/sqlx-oldapi/sqlx-oldapi/sqlx-core)
error: type parameter `DB` goes unused in function definition
  --> sqlx-core/src/error.rs:76:13
   |
76 | fn is_any_db<DB: Database>() -> bool {
   |             ^^^^^^^^^^^^^^ help: consider removing the parameter
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#extra_unused_type_parameters
   = note: `-D clippy::extra-unused-type-parameters` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::extra_unused_type_parameters)]`

error: could not compile `sqlx-core-oldapi` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
Process completed with exit code 101.

[cursor]

The clippy error is fixed by ensuring the “fallback” is_any_db() still uses the DB type parameter even when crate::any is compiled out:

• In the non-Any cfg branch, is_any_db<DB>() now does let _ = std::any::TypeId::of::<DB>(); and returns false, so DB is no longer “unused” and clippy::extra_unused_type_parameters won’t fire.

I also verified clippy is clean with -D warnings (and with targets enabled so the runtime feature is present for sqlx-rt):

• cargo clippy -p sqlx-core-oldapi --features "any,postgres" --all-targets -- -D warnings
• cargo clippy -p sqlx-core-oldapi --features "postgres" --all-targets -- -D warnings

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