Reconcile the parallel-matrix PR build (#2983) with main, which since this branch
diverged landed a competing single-VM build restructure (#2939) and
test-impact-analysis E2E (#2559). Per maintainer decision, #2983's matrix build
supersedes #2939:
- .github/workflows/pull-requests.yaml: keep #2983's
plan/checks/build(matrix)/build-talos/finalize jobs; keep main's newer
resolve_assets/e2e (carrying #2559 test-impact E2E). The build->e2e artifact
interface (pr-patch + talos-image) is identical on both sides, so e2e depends
on finalize/build-talos with no input rewiring. main's top-level permissions
and SHA-pinned action refs applied across all jobs.
- All other files merged cleanly (only pull-requests.yaml conflicted).
Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>