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

[mkocher]

Fix resolute stemcell builds for azure and alicloud.

AI 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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