ci: clean up failed miniconstellation e2e tests

[miampf]

Context

Currently, if a QEMU/miniconstellation e2e test fails or is cancelled, the created resources won't be cleaned up automatically.

Proposed change(s)

• If a test fails or is cancelled, delete the created resource group using the azure CLI.

Additional Info

• A successful run can be seen here (The cleanup happens at the very bottom of "Run e2e MiniConstellation")

Checklist

• [x] Run the E2E tests that are relevant to this PR's changes
• [x] Add labels (e.g., for changelog category)
• [x] Is PR title adequate for changelog?

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