Refactor and split similar tests in matches_pattern_test.rs to multiple files.

I have tried to:
 - Split tests for Structs together
 - Split tests for Tuple Structs together
 - Split tests for Enums together
 - Split tests for Structs and Enums together

PiperOrigin-RevId: 755862546

Author: Googler

googletest/tests/lib.rs

@@ -19,7 +19,10 @@ mod colorized_diff_test;
 mod composition_test;
 mod elements_are_matcher_test;
 mod field_matcher_test;
-mod matches_pattern_test;
+mod matches_pattern_enum_test;
+mod matches_pattern_struct_and_enum_test;
+mod matches_pattern_struct_test;
+mod matches_pattern_tuple_struct_test;
 mod pointwise_matcher_test;
 mod property_matcher_test;
 mod proptest_integration_test;