MINOR: [Release] Add RC number and version to verify release candidate success message (#14664)

I've tested locally when verifying 10.0.1 rc 0:
```
Release candidate number: 0 for version: 10.0.1 looks good!
```

Lead-authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>

Author: raulcd

dev/release/verify-release-candidate.sh

@@ -1198,5 +1198,5 @@ test_binary_distribution
 
 TEST_SUCCESS=yes
 
-echo 'Release candidate looks good!'
+echo "Release candidate ${VERSION}-RC${RC_NUMBER} looks good!"
 exit 0