add: unit test for random circuit generation

[kenya-sk]

I have addressed Issue #1037.
This test case check the output shape and type from random_circuit_resolver_batch and random_symbol_circuit_resolver_batch.

The following are the results of test cases.

$ bazel test //tensorflow_quantum/python:util_test

INFO: Elapsed time: 19.225s, Critical Path: 14.43s
INFO: 204 processes: 3 internal, 201 local.
INFO: Build completed successfully, 204 total actions
//tensorflow_quantum/python:util_test                                    PASSED in 8.0s

Executed 1 out of 1 test: 1 test passes.
There were tests whose specified size is too big. Use the --test_verbose_timeout_warnings command line option to see which ones these are.

[gemini-code-assist]

Code Review

This pull request introduces unit tests for random_circuit_resolver_batch and random_symbol_circuit_resolver_batch to verify their output types and shapes. The review feedback suggests expanding the test coverage to include cases where include_channels=True, as well as adding more rigorous assertions to ensure circuits are correctly parameterized or non-parameterized as expected.

[gemini-code-assist]

The current tests only verify the default behavior where include_channels=False. It would be beneficial to add test cases or parameterize these tests to also cover include_channels=True to ensure that channel-based random circuits are correctly generated and handled.