test(bridge): add unit tests for kNoFlushModules optimisation

[daltoncaoyuan]

Background

Commit 1eab726 introduced a performance optimisation in ModuleManager::webf_invoke_module: modules that never inspect the DOM tree (e.g. Fetch, LocalStorage, Navigator) now skip the FlushUICommand call, avoiding an expensive PostToDartSync round-trip on every invocation.

This PR adds the missing unit tests to verify the correctness of that optimisation.

Changes

Test infrastructure (bridge/test/)

Added g_flush_ui_command_call_count global counter (declared in webf_test_env.h, defined in webf_test_env.cc) so tests can observe whether flushUICommand was triggered.
Updated the TEST_flushUICommand mock to increment the counter on each call.
Registered the new test file in test.cmake.

How to test

# Build bridge (incremental if already built)
npm run build:bridge:macos

# run  tests
bridge/build/macos/lib/x86_64/webf_unit_test --gtest_filter="ModuleManagerNoFlush.*"

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