MINOR: exclude all src/generated and src/generated-test (#10671)

Reviewers: Anna Sophie Blee-Goldman <[email protected]>

Author: chia7712

.gitignore

@@ -51,13 +51,8 @@ docs/generated/
 kafkatest.egg-info/
 systest/
 *.swp
-clients/src/generated
-clients/src/generated-test
 jmh-benchmarks/generated
 jmh-benchmarks/src/main/generated
-streams/src/generated
-raft/src/generated
 raft/.jqwik-database
-core/src/generated
-metadata/src/generated
-storage/src/generated
+**/src/generated
+**/src/generated-test