fix(resolute): remove obsolete metadata_csum workaround and update Az…

[mkocher]

Fix resolute stemcell builds for azure and alicloud.

This PR replaces #631 due to some github wierdness.

AI Slop Summary

Ubuntu 26.04 ships with GRUB 2.12+ which supports metadata_csum_seed
natively (fixed upstream June 2021). The sed workaround in
system_alicloud/apply.sh was a no-op on Resolute (pattern 'metadata_csum,'
does not match 'metadata_csum_seed,') and is no longer needed.

Update the Azure stemcell package list to reflect Ubuntu 26.04 (Resolute)
changes: kernel cloud-tools bumped from 6.8 to 7.0, python3-pyrsistent
replaced by python3-rpds-py, cloud-init-base split added, new jsonschema
dependencies added (python3-jsonschema-specifications, python3-referencing),
python3-passlib added, python3-setuptools removed (not installed by default
in 26.04).

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[Copilot]

Pull request overview

This PR aims to fix Ubuntu 26.04 (Resolute) stemcell builds for AliCloud and Azure by removing an obsolete ext4 metadata workaround and updating the expected Ubuntu/Azure package lists to match Resolute’s dependency changes.

Changes:

• Removed the AliCloud metadata_csum mke2fs.conf sed workaround from the AliCloud system stage.
• Dropped the AliCloud spec assertion that /etc/mke2fs.conf must not mention metadata_csum.
• Updated Ubuntu/Azure dpkg expectation lists for Resolute (e.g., linux-cloud-tools 7.0, jsonschema dependency changes, package additions/removals).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
stemcell_builder/stages/system_alicloud/apply.sh	Removes the ext4 metadata workaround previously applied for AliCloud images.
bosh-stemcell/spec/stemcells/alicloud_spec.rb	Removes the spec that enforced absence of metadata_csum in mke2fs config.
bosh-stemcell/spec/assets/dpkg-list-ubuntu.txt	Updates baseline Ubuntu package expectations (removes python3-setuptools).
bosh-stemcell/spec/assets/dpkg-list-ubuntu-azure-additions.txt	Updates Azure-specific package expectations for Resolute (kernel tools + Python dependency set).

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