Disable CoreML EP for test case GemmTransA_int32_128x128x128 (#25773)
### Description
Fix test failure.
```
1: [ RUN ] GemmOpTest.GemmTransA_int32_128x128x128
1: /Users/runner/work/1/s/onnxruntime/test/providers/base_tester.cc:317: Failure
1: Expected equality of these values:
1: expect_result
1: Which is: 4-byte object <00-00 00-00>
1: ExpectResult::kExpectFailure
1: Which is: 4-byte object <01-00 00-00>
1: Initialize failed but expected success: Could not find an implementation for Gemm(13) node with name 'node1'
1: Google Test trace:
1: /Users/runner/work/1/s/onnxruntime/test/providers/base_tester.cc:849: registered execution providers: CoreMLExecutionProvider
1:
1: /Users/runner/work/1/s/onnxruntime/test/providers/base_tester.cc:317: Failure
1: Expected equality of these values:
1: expect_result
1: Which is: 4-byte object <00-00 00-00>
1: ExpectResult::kExpectFailure
1: Which is: 4-byte object <01-00 00-00>
1: Initialize failed but expected success: Could not find an implementation for Gemm(13) node with name 'node1'
```