(in the first commit, this PR autoformats both yaml files with Zed's
default prettier, to be able to edit those in prettier from now on)

Bundling is a relatively long procedure, and now we have nightly builds
for zed2 (with their own lifecycle, CI file and tag for triggering it
from non-main branch).

Hence, bundling zed1 and/or zed2 by default looks wasteful and
unnecessary, disable them by default.
There's still a `run-build-dmg` label that enables bundling for any PR
needed, and a `startsWith(github.ref, 'refs/tags/v')` check in the CI
run to keep the releases working.

Release Notes:

- N/A