ubuntu/noble: fix PEP440 setuptools --version warnings, perform new_upstream_snapshot

[blackboxsw]

NOTE: This is a resubmital of noble PEP440 fix, yet it seems that our ignore-branches filter is not being honored still.
I've proposed a PR to use an inclusion branches: declaration instead to limit where we run the CLA workflow as 99% of all our PRs are against main. Anyone contributing to downstream ubuntu/branches has already signed the CLA per original commits and features. For any outliers, we will ensure that they have signed the CLA before moving forward with external contributions.

As with #6733. fix daily build recipes for noble which errors on PEP440 because of MESON gymnastics in the setuptools environment.

Resolve PEP440 version warnings about@MISSING_MESON_BUILD_ARTIFACT@ python3 setup.py clean, build or install stages by providing debian/rules $(DEB_VERSION) to the patched setup_utils.py. This allows us to avoid either python3-setuptools-scm dependencies or complex override_dh_auto_(clean|build|install) stages to attempt to create meson_versions.py.

This branch represents 4 actions:

• new_upsream_snapshot.py
• Update debian/rules to export PACKAGED_VERSION=$(DEB_VERSION)
• Simplify d/p/retain-setuptools by dropping tools.read-version and simplify setup_utils.py get_version to read os.environ("PACKAGED_VERSION")
• update changelog

Proposed Commit Message

See individual commits

Additional Context

Test Steps

One can test the build environment behavior with the following:

$ quilt push -a
$ python3 setup.py --version
# expected error because we are missing MISSING_ENVVAR_PACKAGED_VERSION env var
...
packaging.version.InvalidVersion: Invalid version: 'MISSING_ENVVAR_PACKAGED_VERSION'


$ PACKAGED_VERSION=25.3-0ubuntu1~22.04.2 python3 setup.py --version
25.3
quilt pop -a

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)