ci-operator: Enable ErrTypeNotFound on the lease client

[danilo-gemoli]

As of today, when the boskos' client tries to acquire a lease, it doesn't distinguish between these two error cases:

1. There are no leases available anymore.
2. The lease type we are trying to acquire simply doesn't exist.

The previous cases are both handled with the same ErrNotFound and, as a consequence, the client keeps retrying to acquire a lease even when it doesn't make any sense (the type doesn't exist).

Furthermore, with the upcoming "intra-step leasing" feature, clients want to implement the "let's try to acquire a lease of type X, if it exists" behavior, which requires the boskos' client to be able to tell whether an error is ErrNotFound or ErrTypeNotFound.

[openshift-ci-robot]

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[coderabbitai[bot]]

Walkthrough

Added ErrTypeNotFound to the lease package, consolidated error variable declarations into a grouped var block, and set DistinguishNotFoundVsTypeNotFound = true on the underlying boskos client in NewClient.

Changes

Cohort / File(s)	Summary
Error declarations & client config pkg/lease/client.go	Added ErrTypeNotFound = boskos.ErrTypeNotFound; consolidated ErrNotFound and ErrTypeNotFound into a single var block; enabled c.DistinguishNotFoundVsTypeNotFound = true in NewClient.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

✨ Finishing touches

• [ ] 📝 Generate docstrings

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📥 Commits

Reviewing files that changed from the base of the PR and between 875a590daf56288d632c65973b3dbbf56a8381a8 and 006b348e7a3278eb788680ae998859b63ae5ff2b.

📒 Files selected for processing (1)

• pkg/lease/client.go

🚧 Files skipped from review as they are similar to previous changes (1)

• pkg/lease/client.go

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[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danilo-gemoli

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@danilo-gemoli: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/images	006b348e7a3278eb788680ae998859b63ae5ff2b	link	true	/test images
ci/prow/breaking-changes	006b348e7a3278eb788680ae998859b63ae5ff2b	link	false	/test breaking-changes

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