Enhance Azure integration tests with automatic remediation for ghost resource conflicts (#4389)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Medium Risk**
> Changes Azure integration test setup logic to delete/retry on "ghost"
409 Conflict states instead of skipping, which can make previously
non-fatal flakes fail loudly and may increase cleanup/destructive
actions in shared subscriptions. Adds optional per-run resource-group
isolation to reduce cross-test interference.
>
> **Overview**
> Improves Azure integration test robustness by handling *ghost*
control-plane conflicts (create returns `409` but subsequent `Get` is
`404`) with **automatic remediation**: attempt a best-effort delete,
wait, retry creation once, and **fail** if the resource remains
unrecoverable (replacing prior `t.Skip` behavior for
VM/VMSS/role-assignment cases).
>
> Adds optional parallel-run isolation by deriving
`integrationTestResourceGroup` from `AZURE_INTEGRATION_TEST_RUN_ID`
(sanitized/length-capped) and updates integration-test docs and the
adapter-creation skill to reflect the new resource-group behavior and
the “auto-remediate then fail” policy.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
013173ce82183b498ce1d32f5d795d4a090a637c. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

GitOrigin-RevId: 19315221a8b7e93d5db24a6141edb0401b10f7f8

Author: DavidS-ovm