fix(python): prevent OpenSSL linkage in Linux wheels (#3877)

## Summary

- select rustls with native certificate roots explicitly for LanceDB's
remote HTTP client
- add a Linux regression test that rejects `libssl` or `libcrypto`
dependencies in the built Python extension

## Root cause

The Python remote client originally enabled reqwest's native TLS
backend. During manylinux wheel repair, that caused OpenSSL 1.1
libraries to be bundled into the wheel. Loading those libraries on RHEL
9 with FIPS enabled aborts during the OpenSSL self-test before `import
lancedb` can complete.

LanceDB has since moved away from native TLS, but its own reqwest
dependency relied on transitive rustls feature selection and the built
extension had no regression guard. This change makes rustls selection
explicit and tests the produced Linux native module's dynamic
dependencies.

## Validation

- `uv run --no-sync pytest python/tests/test_import.py -q`
- `ruff format --check python`
- `ruff check .`
- `cargo fmt --all -- --check`
- `cargo check --quiet --features remote --tests --examples`
- `ldd python/lancedb/_lancedb.abi3.so` (no `libssl` or `libcrypto`
dependency)
- verified the resolved Python Rust dependency graph contains rustls and
no `openssl-sys` or `native-tls`

Fixes #1884

<!-- lance-gatekeeper-fix:v1 agent=31f916c7ac5c072bbbd54f3539d24f71
generation=1 -->

Co-authored-by: Gatefixer <313497061+lancedb-gatefixer[bot]@users.noreply.github.com>

rust/lancedb/Cargo.toml

@@ -75,6 +75,8 @@ reqwest = { version = "0.12.0", default-features = false, features = [
     "http2",
     "json",
     "macos-system-configuration",
+    # Avoid linking OpenSSL into Python wheels, which breaks on FIPS hosts.
+    "rustls-tls-native-roots",
     "stream",
 ], optional = true }
 http = { version = "1", optional = true } # Matching what is in reqwest