Integration test framework

[carlydf]

What was changed

Add integration tests
Add CI job running linters, unit tests, and integration tests

There is one TODO left in the test setup for creating a draining version. Not all possible pre-existing version statuses are tested right now, but this is ready for review while I concurrently add a few more test cases.

Why?

So that we don't break things

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

[Copilot]

Pull Request Overview

This PR introduces a comprehensive integration test framework that validates the temporal worker controller's behavior end-to-end by testing against both Kubernetes and Temporal deployments. The framework includes helper utilities for creating test scenarios and setting up the test environment.

• Adds an integration test framework using Go's native testing package with real Temporal and Kubernetes environments
• Creates builder patterns for constructing test scenarios with temporal worker deployments and expected status
• Provides utilities for environment setup, worker simulation, and status verification

Reviewed Changes

Copilot reviewed 40 out of 42 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
internal/tests/internal/integration_test.go	Main integration test logic with test scenarios for rollout strategies
internal/tests/internal/test_helpers.go	Helper functions for status verification and temporal deployment operations
internal/tests/internal/workers.go	Worker simulation code that mimics real temporal workers for testing
internal/tests/internal/env_helpers.go	Environment setup utilities for Kubernetes and controller initialization
internal/testhelpers/test_builder.go	Builder pattern utilities for constructing test cases and expected statuses
internal/testhelpers/make.go	Factory functions for creating test objects with proper configurations
internal/tests/go.mod	Go module definition for the integration tests
internal/tests/README.md	Comprehensive documentation for running and extending the integration tests

Comments suppressed due to low confidence (2)

internal/tests/go.mod:3

• Go version 1.24.1 does not exist. The latest stable Go version is 1.21.x as of my knowledge cutoff. This appears to be a future version that doesn't exist yet.

go 1.24.1

internal/tests/go.mod:5

• Go toolchain version 1.24.3 does not exist. This appears to be a future version that doesn't exist yet.

toolchain go1.24.3