🌱 replace opentelemetry-operator with /apis sub-module v0.153.0

[nickytd]

How to categorize this PR?

/kind bug
/area logging
/area dev-productivity

What this PR does / why we need it:

Replaces the github.com/open-telemetry/opentelemetry-operator v0.146.0 dependency with the carved-out sub-module github.com/open-telemetry/opentelemetry-operator/apis v0.153.0.

The OpenTelemetry Operator v0.153.0 release moved the apis/ package into a dedicated Go sub-module. The new sub-module has no dependency on sigs.k8s.io/controller-runtime — only k8s.io/api, k8s.io/apimachinery, and small utility libs.

This repo only imports apis/v1beta1 (the OpenTelemetryCollector CRD type and AddToScheme), so the import paths stay identical and no source changes are required.

Which issue(s) this PR fixes:

Unblocks #491 and #501, both of which fail CI with:

# github.com/open-telemetry/opentelemetry-operator/apis/v1beta1
.../opentelemetry-operator@v0.146.0/apis/v1beta1/collector_webhook.go:451:34:
  not enough arguments in call to ctrl.NewWebhookManagedBy
      have (controllerruntime.Manager)
      want (manager.Manager, T)

The error is in the parent module's webhook code, which calls a controller-runtime API that became generic in newer versions. By switching to the apis sub-module we never compile that webhook file, so transitive controller-runtime bumps (e2e-framework → 0.7.0 in #491, controller-runtime → 0.24.1 in #501) no longer break us.

Closes #491.

Special notes for your reviewer:

• Diff is go.mod / go.sum only — no source files touched. pkg/controller/otelcol_reconciler.go already imports .../apis/v1beta1, which resolves to the new sub-module without any code change.
• go.sum shrinks by ~250 lines: the old parent module pulled in cert-manager, prometheus-operator, gateway-api, cel-go, openshift APIs, AWS/Azure SDKs, etc. — none of which we use.
• The apis sub-module declares go 1.26.0; this repo is already on go 1.26.3, so the floor is satisfied.
• After merge, please rebase 🌱 bump sigs.k8s.io/controller-runtime from 0.22.5 to 0.24.1 #501 (controller-runtime 0.24.1 bump) — it should go green.
• make verify is clean locally (fmt, gci, go fix, full test suite).

Release note:

Replaced `github.com/open-telemetry/opentelemetry-operator` with the carved-out `github.com/open-telemetry/opentelemetry-operator/apis` sub-module (v0.153.0), unblocking controller-runtime upgrades.

[gardener-prow]

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