feat(pivot): port k8sevents off internal pipeline+consumer to upstream

[trilamsr]

Summary

• Port components/receivers/k8sevents off the v0.1.x internal facades
  (internal/pipeline, internal/consumer, internal/runtime/lifecycle)
  onto upstream
  go.opentelemetry.io/collector/{component,receiver,consumer} v1.59.0 —
  the canonical types the OCB-generated _build/main.go already consumes.
  Mirrors PR-B2 feat(pivot): PR-B2 — port nccl_fr off internal pipeline+consumer #201 (nccl_fr); same type-swap table applied.
• Factory is now receiver.NewFactory(componentType, createDefaultConfig, receiver.WithLogs(createLogs, component.StabilityLevelBeta)) instead of
  a hand-rolled struct implementing internal/pipeline.ReceiverFactory.
  Stability level (Beta) preserved so OCB-surfaced metadata doesn't
  regress.
• k8sEventsReceiver implements receiver.Logs via Start(ctx, component.Host) error / Shutdown(ctx) error; the
  pipeline.ComponentState embed dropped (upstream component.Component
  carries no equivalent mixin; the multi-source lifecycle bookkeeping
  already lives in the sibling lifecycle.go from PR feat(pivot): port k8sevents off internal selftel + lifecycle (PR-F unblock) #196).
• Logger swapped from *slog.Logger → upstream's *zap.Logger. Every
  call site converted to zap.String / Int / Int64 / Duration / Strings / Bool / Error fields; log messages and field names preserved
  byte-for-byte so operator log-content alerting doesn't regress.

Multi-source specifics

Unlike PR-B1/B2 nccl_fr (single-source, single lc.Start), k8sevents
runs an Events informer + an optional Node informer in parallel under
the package-local lifecycle helper's Add(). Both sources fan into the
same selfTelemetry instance; the receiver-wide degraded flag stays
the OR of per-source degradedEvent / degradedNode bits — preserved
across the port. Per-source error kinds (KindNodeWatch,
KindNodeParse, KindNodePanic, KindNodeBackpressureDrop) still
fire on the correct path; the
TestReceiver_NodeWatchErrorFiresDistinctKind /
TestReceiver_EmitNodePreservesEventDegraded /
TestReceiver_NodeParseAndPanicFireDistinctKinds falsifiers stay
green.

Hard gate

PR-I.1 (submodule extraction) requires zero internal/(pipeline| consumer|runtime/lifecycle) import hits in the package. This PR clears
it:

$ grep -rn 'internal/pipeline\|internal/consumer\|internal/runtime/lifecycle' \
    components/receivers/k8sevents/*.go
components/receivers/k8sevents/factory.go:27:// internal/pipeline factory; PR-F preserves it across the upstream
components/receivers/k8sevents/lifecycle.go:4:// v0.1.x dependency on `internal/runtime/lifecycle`, which is slated

Two comment-only mentions remain — historical context for the
v0.1.x → v0.2.0 migration, not imports.

Predecessor

PR #196 (merged) ported the self-telemetry + lifecycle helpers into
the package as siblings (with the multi-source Add() k8sevents needs).
This PR handles the pipeline + consumer + factory layer — the last
remaining internal/* imports in the package.

Type-swap reference

Same mapping PR-B2 #201 established:

Internal	Upstream
internal/pipeline.Type	component.Type
internal/pipeline.ReceiverFactory	receiver.Factory
internal/pipeline.CreateSettings	receiver.Settings (via receivertest.NewNopSettings in tests)
internal/pipeline.Config	component.Config
internal/pipeline.Receiver	receiver.Logs (= interface{ component.Component })
internal/consumer.Logs	consumer.Logs
*slog.Logger	*zap.Logger
internal/pipeline.MustNewType	component.MustNewType
internal/pipeline.MustNewID	component.NewIDWithName
set.Telemetry.Logger / set.Telemetry.MeterProvider / set.Telemetry.Resource	set.Logger / set.MeterProvider / set.Resource (flattened via embedded TelemetrySettings)

Test plan

• go build ./... — green
• go test -race ./components/receivers/k8sevents/... — 60+ tests
  pass (incl. multi-source informer + degraded-state falsifiers +
  goleak)
• go test ./... — green except pre-existing
  kernelevents/TestReceiver_SLIBudget flake (passes on retry; same
  flake PR-B2 documented)
• make check — golangci-lint + go vet + go mod verify — green
• No log/slog imports remain in the package
• Hard-gate grep returns only the two comment-only mentions

Compatibility note

No new module versions added — k8sevents inherits the upstream pins PR-B2
already brought in (collector/component, collector/receiver,
collector/consumer v1.59.0; zap 1.28.0; receiver/receivertest
v0.153.0).

NONE