refactor(core): introduce separate go module for apis

[IvoGoman]

Description

This separation is introduced to make imports of the
API types easier for dependent projects

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Style
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build
• 🔁 CI
• 📦 Chore (Release)
• ⏩ Revert

Related Tickets & Documents

• related issue [FEAT] - separate go module for ./api #1803

Added tests?

• 👍 yes
• 🙅 no, because they aren't needed
• 🙋 no, because I need help
• Separate ticket for tests # (issue/pr)

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Added to documentation?

• 📜 README.md
• 🤝 Documentation pages updated
• 🙅 no documentation needed
• (if applicable) generated OpenAPI docs for CRD changes

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

[Copilot]

Pull request overview

This PR splits the Kubernetes API types into a dedicated Go module (github.com/cloudoperators/greenhouse/api) to make importing API packages easier for external consumers, and updates core code to consume API-owned types (notably SCIM auth types) instead of internal equivalents.

Changes:

• Introduces a separate api/ Go module with its own go.mod/go.sum and API-only test suites.
• Moves SCIM auth type definitions from internal/scim into the public API package and updates call sites accordingly.
• Updates the build/test flow to run go test for the new API module from the Makefile.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Makefile	Adds test-api target and wires it into make test.
go.mod	Adds local replace + requirement for the new api module; bumps some k8s requires.
internal/webhook/v1alpha1/organization_webhook.go	Switches SCIM auth-type comparisons to API constants.
internal/webhook/v1alpha1/organization_webhook_test.go	Updates webhook tests to use API SCIM auth-type constants.
internal/util/scim_config.go	Updates SCIM config translation to use API SCIM auth-type constants.
internal/scim/scim_types.go	Removes internal SCIM auth type definitions (now owned by API module).
internal/scim/scim_client.go	Updates SCIM client config to use API AuthType.
internal/scim/scim_client_test.go	Updates SCIM client tests to use API auth-type constants.
internal/controller/organization/organization_controller_test.go	Updates controller tests to use API SCIM auth-type constants.
api/v1alpha1/organization_types.go	Introduces API-owned AuthType + constants and updates SCIMConfig field type.
api/v1alpha1/api_suite_test.go	Removes dependency on internal test helpers from API-module suite setup.
api/meta/v1alpha1/suite_test.go	Removes dependency on internal test helpers from API-module suite setup.
api/v1alpha1/zz_generated.deepcopy.go	Regenerated deepcopy with adjusted metav1 import aliasing.
api/meta/v1alpha1/zz_generated.deepcopy.go	Removes empty import block from generated deepcopy file.
api/go.mod	New module definition for github.com/cloudoperators/greenhouse/api.
api/go.sum	New module dependency lockfile for the API module.

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