chore: update clean up pipeline

[vilit1]

1. change the storage + registry prefixes for init to easily separate the test ran
2. update the clean up pipeline to delete the storage + registry prefixes for init (and just custom prefix if you feel like it)
3. remove keyvault clean up

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[vilit1]

Example runs:
new prefix
https://github.com/Azure/azure-iot-ops-cli-extension/actions/runs/11219994335

old prefix
https://github.com/Azure/azure-iot-ops-cli-extension/actions/runs/11187224852

[vilit1]

example with custom input
https://github.com/Azure/azure-iot-ops-cli-extension/actions/runs/11220201291
https://github.com/Azure/azure-iot-ops-cli-extension/actions/runs/11220201291/job/31187854277#step:6:1

[c-ryan-k]

This is dangerous but I understand why it's necessary - perhaps in the future we should add some kind of checking for a "do not delete" tag of sorts?

[vilit1]

future thing yea but we like to live dangerously