feat: toggle service links in deployments

[Tom Bojer (tombojer)]

This pull request adds support for configuring the enableServiceLinks field in container specifications throughout the codebase. This allows users to control whether Kubernetes injects service environment variables into containers. The changes ensure that this field is properly handled in the API, merged correctly, propagated to all relevant Kubernetes workload specs, and thoroughly tested.

API and Spec Updates:

• Added an optional EnableServiceLinks field to ContainerSpec and ContainerMergeSpec, with appropriate defaulting and deepcopy logic for safe copying. [1] [2] [3] [4]

Merging Logic:

• Updated the Merge method for ContainerSpec to correctly merge the EnableServiceLinks field from ContainerMergeSpec.

Propagation to Workloads:

• Updated all workload constructors (AdminDeployment, StorefrontDeployment, WorkerDeployment, ScheduledTaskJob, SetupJob, MigrationJob, snapshotJob, getJobSpec, DebugPod) to set EnableServiceLinks from the container spec. [1] [2] [3] [4] [5] [6] [7] [8] [9]

Testing:

• Added and updated tests to verify correct merging and propagation of EnableServiceLinks in container specs and workload generation. [1] [2] [3]

Helper Functions:

• Introduced a boolPtr helper in test files to simplify pointer creation for boolean fields. [1] [2] [3]