src: remove main_isolate
This addresses a TODO comment (fyi @joyeecheung).
Checklist
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make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This addresses a TODO comment (fyi @joyeecheung).
make -j4 test (UNIX), or vcbuild test (Windows) passes