Prepare tests not to be affected by the name of the default branch
"git init" creates.
* js/default-branch-name-tests-final-stretch: (28 commits)
tests: drop prereq `PREPARE_FOR_MAIN_BRANCH` where no longer needed
t99*: adjust the references to the default branch name "main"
tests(git-p4): transition to the default branch name `main`
t9[5-7]*: adjust the references to the default branch name "main"
t9[0-4]*: adjust the references to the default branch name "main"
t8*: adjust the references to the default branch name "main"
t7[5-9]*: adjust the references to the default branch name "main"
t7[0-4]*: adjust the references to the default branch name "main"
t6[4-9]*: adjust the references to the default branch name "main"
t64*: preemptively adjust alignment to prepare for `master` -> `main`
t6[0-3]*: adjust the references to the default branch name "main"
t5[6-9]*: adjust the references to the default branch name "main"
t55[4-9]*: adjust the references to the default branch name "main"
t55[23]*: adjust the references to the default branch name "main"
t551*: adjust the references to the default branch name "main"
t550*: adjust the references to the default branch name "main"
t5503: prepare aligned comment for replacing `master` with `main`
t5[0-4]*: adjust the references to the default branch name "main"
t5323: prepare centered comment for `master` -> `main`
t4*: adjust the references to the default branch name "main"
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