Upgrade to Operator SDK 1.41.1 (#211)

* Add missing improvements from Operator SDK 1.34.1

These were not mentioned in the upgrade documentation for version 1.34.x (https://sdk.operatorframework.io/docs/upgrading-sdk-version/v1.34.0/), but I've found them by compating the release with the previous one (https://github.com/operator-framework/operator-sdk/compare/v1.33.0...v1.34.1).

* Upgrade to Operator SDK 1.36.0

Source of upgrade steps: https://sdk.operatorframework.io/docs/upgrading-sdk-version/v1.36.0/
Key differences:
- Go packages `k8s.io/*` are already at a version higher than the one in the upgrade.
- `ENVTEST_K8S_VERSION` is at a version higher than the one in the upgrade
- We didn't have the golangci-lint make command before, thus we only needed to add things.

* Upgrade to Operator SDK 1.38.0

Source of upgrade steps: https://sdk.operatorframework.io/docs/upgrading-sdk-version/v1.38.0/

* Upgrade to Operator SDK 1.39.0

Source of upgrade steps: https://sdk.operatorframework.io/docs/upgrading-sdk-version/v1.39.0/

* Upgrade to Operator SDK 1.40.0

Source of upgrade steps: https://sdk.operatorframework.io/docs/upgrading-sdk-version/v1.40.0/

I didn't do the "Add app.kubernetes.io/name label to your manifests" since it seems that we have it already, and it's customized.

* Address lint errors

* Update golangci-lint version used to support Go 1.24

* Improve workflows

- Make workflow targets more specific.
- Make build workflow only build (i.e. remove test part of it).
- Rearrange steps and improve naming for build workflow.

* Add back deleted test

Initially the test has been removed due to lint saying that it was duplicate code, but it falsely errored since the values are different.

* Improve code and add missing upgrade pieces

* Upgrade to Operator SDK 1.41.1

Source of upgrade steps: https://sdk.operatorframework.io/docs/upgrading-sdk-version/v1.41.0/

Upgrading to 1.41.1 from 1.40.0 doesn't have any migration steps.

Key elements:
- Upgrade to golangci-lint v2
- Made the manifests using the updated controller tools

* Address linter errors

golanci-lint v2 seems to be more robust than the previous one, which is beneficial. Thus, we address the linter errors thrown by v2 and improve our code even further.

* Add Makefile improvements

These were brought in by comparing the Makefile of a freshly created operator using the latest operator-sdk with ours.

* Add missing default kustomization for 1.40.0 upgrade

* Bring default kustomization to latest version

This is done by putting the file's content from a newly-generated operator.

* Switch metrics-bind-address default value back to 8080

This ensures that the upgrade is backwards-compatible.

* Add webhook-related scaffolding

This enables us to easily add support for webhooks by running `operator-sdk create webhook` whenever we want to add them.

* Fix typo

.golangci.yml

@@ -0,0 +1,52 @@
+version: "2"
+run:
+  allow-parallel-runners: true
+linters:
+  default: none
+  enable:
+    - copyloopvar
+    - dupl
+    - errcheck
+    - ginkgolinter
+    - goconst
+    - gocyclo
+    - govet
+    - ineffassign
+    - lll
+    - misspell
+    - nakedret
+    - prealloc
+    - revive
+    - staticcheck
+    - unconvert
+    - unparam
+    - unused
+  settings:
+    revive:
+      rules:
+        - name: comment-spacings
+        - name: import-shadowing
+  exclusions:
+    generated: lax
+    rules:
+      - linters:
+          - lll
+        path: api/*
+      - linters:
+          - dupl
+          - lll
+        path: internal/*
+    paths:
+      - third_party$
+      - builtin$
+      - examples$
+formatters:
+  enable:
+    - gofmt
+    - goimports
+  exclusions:
+    generated: lax
+    paths:
+      - third_party$
+      - builtin$
+      - examples$