feat(Unity): Added is_main_thread to Unity context

[bitsandfoxes]

Extended the Unity context by is_main_thread (boolean).

[github-actions]

🚨 Warning: This pull request contains Frontend and Backend changes!

It's discouraged to make changes to Sentry's Frontend and Backend in a single pull request. The Frontend and Backend are not atomically deployed. If the changes are interdependent of each other, they must be separated into two pull requests and be made forward or backwards compatible, such that the Backend or Frontend can be safely deployed independently.

Have questions? Please ask in the #discuss-dev-infra channel.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
43446	1	43445	251

View the top 1 failed test(s) by shortest run time

tests.sentry.event_manager.interfaces.test_contexts::test_unity

Stack Traces | 0.052s run time

#x1B[1m#x1B[.../event_manager/interfaces/test_contexts.py#x1B[0m:189: in test_unity
    make_ctx_snapshot(
#x1B[1m#x1B[.../event_manager/interfaces/test_contexts.py#x1B[0m:16: in inner
    insta_snapshot(
#x1B[1m#x1B[31mE   Failed: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#x1B[0m
#x1B[1m#x1B[31mE   Snapshot .../snapshots/test_contexts/test_unity.pysnap changed!#x1B[0m
#x1B[1m#x1B[31mE   #x1B[0m
#x1B[1m#x1B[31mE   #x1B[0m
#x1B[1m#x1B[31mE   Re-run pytest with SENTRY_SNAPSHOTS_WRITEBACK=new and then use 'make review-python-snapshots' to review.#x1B[0m
#x1B[1m#x1B[31mE   #x1B[0m
#x1B[1m#x1B[31mE   Or: Use SENTRY_SNAPSHOTS_WRITEBACK=1 to update snapshots directly.#x1B[0m
#x1B[1m#x1B[31mE   #x1B[0m
#x1B[1m#x1B[31mE   #x1B[0m
#x1B[1m#x1B[31mE   --- #x1B[0m
#x1B[1m#x1B[31mE   #x1B[0m
#x1B[1m#x1B[31mE   +++ #x1B[0m
#x1B[1m#x1B[31mE   #x1B[0m
#x1B[1m#x1B[31mE   @@ -0,0 +1,15 @@#x1B[0m
#x1B[1m#x1B[31mE   #x1B[0m
#x1B[1m#x1B[31mE   +errors: null#x1B[0m
#x1B[1m#x1B[31mE   +tags:#x1B[0m
#x1B[1m#x1B[31mE   +- - unity.install_mode#x1B[0m
#x1B[1m#x1B[31mE   +  - Store#x1B[0m
#x1B[1m#x1B[31mE   +- - unity.is_main_thread#x1B[0m
#x1B[1m#x1B[31mE   +  - 'yes'#x1B[0m
#x1B[1m#x1B[31mE   +to_json:#x1B[0m
#x1B[1m#x1B[31mE   +  unity:#x1B[0m
#x1B[1m#x1B[31mE   +    active_scene_name: MainScene#x1B[0m
#x1B[1m#x1B[31mE   +    editor_version: 2022.3.1f1#x1B[0m
#x1B[1m#x1B[31mE   +    install_mode: Store#x1B[0m
#x1B[1m#x1B[31mE   +    is_main_thread: true#x1B[0m
#x1B[1m#x1B[31mE   +    rendering_threading_mode: MultiThreaded#x1B[0m
#x1B[1m#x1B[31mE   +    target_frame_rate: '60'#x1B[0m
#x1B[1m#x1B[31mE   +    type: unity#x1B[0m
#x1B[1m#x1B[31mE   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#x1B[0m

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