Handle empty change indices in SAM's mask to rle conversion (#35665)
* Handle empty change indices in RLE conversion for masks
* [test] Add unit tests for RLE encoding of masks in SamProcessor
* [test] Update RLE conversion tests to use TensorFlow implementation
* [test] Fix formatting in SamProcessorTest according to check_code_quality action
* [test] Fix formatting in SamProcessorTest according to check_code_quality
* [test] Refactored rle test cases into one test and used tf tensors in tf test cases
* [test] Fix: removed self parameter from refactored methods
* [test] Removed nested methods in run-length encoding tests for PyTorch and TensorFlow
* [test] Added description to individual to run-length encoding tests for PyTorch and TensorFlow.