🏗️🚮：drop the queue label's plain spelling

[DerekNonGeneric]

The follow-up #1860 set up. The label is renamed, so the plain spelling
the condition also accepted is gone.

Done outside this branch

commit-queue was renamed to 🚀 Status: Commit Queue through the API.
A rename rather than a create-and-delete, so it keeps its colour, its
description and anything carrying it:

$ gh api -X PATCH .../labels/commit-queue -f new_name='🚀 Status: Commit Queue'
🚀 Status: Commit Queue  #0e8a16  Land this pull request when its checks pass

$ gh api .../labels/commit-queue
{"message":"Not Found","status":"404"}

Nothing carried it at the time, so nothing moved.

In here

• the condition matches the one name, quoted whole because the label
  contains a colon and an unquoted scalar reads that as a mapping
• the handbook names the label a reader has to apply, so it says the
  same thing

nps verify.yaml caught the quoting: the first attempt at the
condition was an unquoted scalar and did not parse.

This is the pull request that tests it

Landing this one exercises the renamed label against the workflow that
merged in #1860, which is the last step that has not been proven yet.
If the queue does not pick it up, the condition on the base branch is
still the one accepting both names, so the old spelling would have to
be reinstated rather than anything being stuck.

Verified

• the workflow parses, and the condition resolves to
  github.event.label.name == '🚀 Status: Commit Queue'
• the removal step was run verbatim against the API in 🏗️♻️：let the queue label take either name #1860, on a
  label named with an emoji, a space, a colon and an apostrophe
• nps test passes

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