chore(azure): drop unsupported interim release image streams

[blackboxsw]

• chore(azure): drop unsupported interim release image streams

PR Checklist

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• I have added unit tests to cover the new behavior under ``tests/unit_tests/```
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Description

Update Canonical no longer published images on Azure for unsupported interim Ubuntu releases. Drop interim image stream references which are now absent.

Additional Context and Relevant Issues

Validated Image stream offering absence against the current published image list from Canonical using:
az vm image list -p Canonical --all -o table

Test Steps

# with an authorized azure cli client, verify all Canonical images published assert no dropped  image exists
root@publishing-n:~# az vm image list -p Canonical --all -o table| egrep '21_|22_10|23_|24_10' 
root@publishing-n:~# 

[holmanb]

Thanks @blackboxsw!