[P4_Symbolic] Add ability to ignore empty tables for default action coverage. Add unit test for exclude_empty_tables config. Fix inconsistent test data. Move internal function EvaluateSingleMatch to unamed namespace.

[VSuryaprasad-HCL]

Keyword Check:
~/sonic-buildimage/src/sonic-p4rt/sonic-pins$ ~/tools/keyword_checks.sh .
Keyword check Passed.

Build Result:
/sonic/src/sonic-p4rt/sonic-pins$ bazel build $BAZEL_BUILD_OPTS ...
INFO: Analyzed 641 targets (0 packages loaded, 0 targets configured).
INFO: Found 641 targets...
INFO: Elapsed time: 0.746s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action

Test Result:
/sonic/src/sonic-p4rt/sonic-pins$ bazel test $BAZEL_BUILD_OPTS --cache_test_results=no ...
INFO: Analyzed 641 targets (0 packages loaded, 0 targets configured).
INFO: Found 427 targets and 214 test targets...
INFO: Elapsed time: 199.462s, Critical Path: 121.93s
INFO: 268 processes: 323 linux-sandbox, 18 local.
INFO: Build completed successfully, 268 total actions
//dvaas:port_id_map_test PASSED in 0.8s
//dvaas:test_run_validation_golden_test PASSED in 0.1s
//dvaas:test_run_validation_test PASSED in 0.6s
//dvaas:test_run_validation_test_runner PASSED in 0.0s
//dvaas:test_vector_stats_diff_test PASSED in 0.1s
//dvaas:test_vector_stats_test PASSED in 0.0s
//dvaas:test_vector_test PASSED in 0.6s
//dvaas:user_provided_packet_test_vector_diff_test PASSED in 0.1s
//dvaas:user_provided_packet_test_vector_test PASSED in 0.1s
//gutil:collections_test PASSED in 0.5s
//gutil:io_test PASSED in 0.7s
//gutil:proto_matchers_test PASSED in 0.7s
//p4rt_app/tests:response_path_test PASSED in 6.7s
//p4rt_app/tests:role_test PASSED in 1.7s
//p4rt_app/tests:state_verification_test PASSED in 2.8s
//p4rt_app/tests:vrf_table_test PASSED in 2.6s
//p4rt_app/tests/lib:app_db_entry_builder_test PASSED in 0.0s
//p4rt_app/utils:event_data_tracker_test PASSED in 0.0s
//p4rt_app/utils:table_utility_test PASSED in 0.7s
//sai_p4/instantiations/google:clos_stage_test PASSED in 0.5s
//sai_p4/instantiations/google:fabric_border_router_p4info_up_to_date_test PASSED in 0.1s
//sai_p4/instantiations/google:middleblock_p4info_up_to_date_test PASSED in 0.0s
//sai_p4/instantiations/google:sai_nonstandard_platforms_build_test PASSED in 0.0s
//sai_p4/instantiations/google:sai_nonstandard_platforms_cc_test PASSED in 0.6s
//sai_p4/instantiations/google:sai_p4info_fetcher_test PASSED in 0.8s
//sai_p4/instantiations/google:sai_p4info_test PASSED in 1.1s
//sai_p4/instantiations/google:sai_pd_proto_test PASSED in 0.0s
//sai_p4/instantiations/google:sai_pd_util_test PASSED in 0.6s
//sai_p4/instantiations/google:tor_p4info_up_to_date_test PASSED in 0.0s
//sai_p4/instantiations/google:union_p4info_up_to_date_test PASSED in 0.1s
//sai_p4/instantiations/google:wbb_p4info_up_to_date_test PASSED in 0.8s
//sai_p4/instantiations/google/test_tools:table_entry_generator_helper_test PASSED in 1.8s
//sai_p4/instantiations/google/test_tools:test_entries_test PASSED in 1.0s
//sai_p4/instantiations/google/tests:p4_fuzzer_integration_test PASSED in 3.5s
//sai_p4/tools:p4info_tools_test PASSED in 0.7s
//sai_p4/tools:packetio_tools_test PASSED in 0.8s
//tests:thinkit_gnmi_interface_util_tests PASSED in 1.1s
//tests/lib:p4info_helper_test PASSED in 0.9s
//tests/lib:p4rt_fixed_table_programming_helper_test PASSED in 0.7s
//tests/lib:packet_generator_test PASSED in 27.1s
//tests/lib:switch_test_setup_helpers_golden_test PASSED in 0.1s
//tests/lib:switch_test_setup_helpers_golden_test_runner PASSED in 0.1s
//tests/qos:gnmi_parsers_test PASSED in 0.1s
//tests/qos:gnmi_parsers_test_runner PASSED in 0.0s
//tests/sflow:sflow_util_test PASSED in 0.9s
//thinkit:bazel_test_environment_test PASSED in 0.6s
//thinkit:generic_testbed_test PASSED in 0.9s
//thinkit:mock_control_device_test PASSED in 0.7s
//thinkit:mock_generic_testbed_test PASSED in 0.7s
//thinkit:mock_mirror_testbed_test PASSED in 0.7s
//thinkit:mock_ssh_client_test PASSED in 0.1s
//thinkit:mock_switch_test PASSED in 0.8s
//thinkit:mock_test_environment_test PASSED in 0.1s
//thinkit:switch_test PASSED in 0.7s
//sai_p4/instantiations/google/tests:p4_constraints_integration_test PASSED in 1.0s
Stats over 5 runs: max = 1.0s, min = 0.7s, avg = 0.8s, dev = 0.1s
//sai_p4/instantiations/google/test_tools:table_entry_generator_test PASSED in 43.9s
Stats over 50 runs: max = 43.9s, min = 0.8s, avg = 1.9s, dev = 6.1s

Executed 214 out of 214 tests: 214 tests pass.
INFO: Build completed successfully, 268 total actions

[mssonicbld]

/azp run

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[jaanah-hcl]

@kishanps Kindly review the PR

[mssonicbld]

/azp run

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[VSuryaprasad-HCL]

Co-authored-by:kheradmandG kheradmand@google.com
Co-authored-by: Srikishen Pondicherry Shanmugam kishanps@google.com

[mssonicbld]

/azp run

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