[SPARK-50304][INFRA] Remove (any|empty).proto from RAT exclusion

### What changes were proposed in this pull request?

This PR aims to remove `(any|empty).proto` from RAT exclusion.

### Why are the changes needed?

`(any|empty).proto` files were never a part of Apache Spark repository. Those files were only used in the initial `Connect` PR and removed before merging.
- #37710
  - Added: 45c7bc5
  - Excluded from RAT check: cf6b19a
  - Removed: 4971980

### Does this PR introduce _any_ user-facing change?

No. This is a dev-only change.

### How was this patch tested?

Pass the CIs or manual check.

```
$ ./dev/check-license
Ignored 0 lines in your exclusion files as comments or empty lines.
RAT checks passed.
```

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #48837 from dongjoon-hyun/SPARK-50304.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Hyukjin Kwon <[email protected]>

Author: dongjoon-hyun

dev/.rat-excludes

@@ -126,9 +126,6 @@ exported_table/*
 node_modules
 spark-events-broken/*
 SqlBaseLexer.tokens
-# Spark Connect related files with custom licence
-any.proto
-empty.proto
 .*\.explain
 .*\.proto.bin
 LimitedInputStream.java