Retire Debian Bullseye packaging builders

[serhat andic (serhatandic)]

Summary

• remove Debian Bullseye from os-list.csv and the five packaging workflows that consume it
• delete the generated debian-bullseye-all Dockerfile
• reject Bullseye early in image build and push entry points
• document the retired builder while preserving existing packages and images

Validation

• generator checks passed
• mocked rejection guard checks passed

Merge order

Land consumer removals before this PR, especially all-citus, debian-hll, and debian-topn ARM64 jobs that currently consume the live develop builder. Existing packages and images are intentionally preserved.

Those live ARM64 consumer removals are:

• Retire Bullseye from Citus release and nightly builds #1233: all-citus
• Retire Bullseye from HLL package builds #1226: debian-hll
• Retire Bullseye from TopN package builds #1225: debian-topn

Other coordinated consumer retirements: citusdata/tools#432, citusdata/citus#8837, citusdata/citus#8835, citusdata/citus#8836, #1227, #1228, #1229, #1230, #1231, #1232, and #1235.

Public installer retirement: #1236. Automation-host upgrade: citusdata/test-automation#280.

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