[Task] PHP: Fix memory leaks and resource management issues in C extension

[prateek-kumar-improving]

Description

The following issues in PHP will be fixed as part of this task:

1. _initialize_open_telemetry() can throw an exception, but valkey_glide_build_client_config_base() ignores it, returning SUCCESS with a pending exception. This leaks the config and passes a bad state into the Rust FFI.

2. execute_command_with_route() in command_response.c leaks route_bytes and route.key when parameter validation fails after route allocation.

3. execute_sort_command() and execute_sort_ro_command() call efree() on offset_str/count_str unconditionally, but these are only allocated when a LIMIT option is present. This crashes PHP debug builds.

4. free_valkey_glide_object() does not free buffered_commands. If the object is destroyed mid-batch (exception, scope exit), all buffered command data leaks.

5. ValkeyGlide::close() and ValkeyGlideCluster::close() are no-ops — they return true without releasing the Rust client. Connections are only freed on garbage collection.

Checklist

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Additional Notes

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