Merge branch 'js/no-more-prepare-for-main-in-test'

Test coverage fix. * js/no-more-prepare-for-main-in-test: tests: drop the `PREPARE_FOR_MAIN_BRANCH` prereq t9902: use `main` as initial branch name t6302: use `main` as initial branch name t5703: use `main` as initial branch name t5510: use `main` as initial branch name t5505: finalize transitioning to using the branch name `main` t3205: finalize transitioning to using the branch name `main` t3203: complete the transition to using the branch name `main` t3201: finalize transitioning to using the branch name `main` t3200: finish transitioning to the initial branch name `main` t1400: use `main` as initial branch name