ci(pr): use CNCF Oracle runners for e2e

[kvaps]

Summary

Switch the e2e job from GitHub-hosted `ubuntu-latest` to the CNCF-provided Oracle runner pool on the cozystack org, mirroring the pattern in cozystack/cozystack's pull-requests workflow.

```yaml
runs-on: ${{ contains(github.event.pull_request.labels.*.name, 'debug') && 'self-hosted' || 'oracle-vm-24cpu-96gb-x86-64' }}
```

PR label	Runner	Why
(default)	`oracle-vm-24cpu-96gb-x86-64` (24 CPU / 96 GB / x86-64, CNCF-funded Oracle pool)	Ephemeral, big enough for real-DRBD QEMU stands
`debug`	`self-hosted`	Long-lived so the breakpoint step can attach SSH

Why

`ubuntu-latest` (4 CPU / 16 GB / no KVM) only fits the kind-based tier. The real-DRBD QEMU stand (`make e2e` → Talos VMs in `.work/`) needs ~50 GB RAM and KVM nested virt — Oracle 24 CPU / 96 GB has both. With this swap the e2e job can drive the cli-matrix suite end-to-end without a separate bare-metal stand.

Also

• Drop `continue-on-error: true` from the e2e job. It was added when the runner was the cramped `ubuntu-latest`; with real hardware the job should gate the PR again.
• Bump `timeout-minutes` from 60 → 180 to match cozystack's e2e budget (real-DRBD scenarios can run long).

Test plan

• CI picks the Oracle runner (regular PR).
• Add `debug` label → CI picks `self-hosted`; breakpoint step has somewhere to attach.
• e2e suite completes within 180 min.

[gemini-code-assist]

Note

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[kvaps]

Superseded by #10 (bundled with the other two CI cleanups so the pipeline runs once).