feat: add BarePodManager implementing SandboxProvider

[thoraxe]

Summary

• Add SetStep() to SandboxProvider interface so providers receive resolved step config before each Claim call
• Implement BarePodManager — creates/waits/deletes bare Pods using PodSpecBuilder
• Pod naming follows existing ls-{step}-{proposalName} truncation convention
• Includes kubebuilder RBAC marker for Pod CRUD permissions

Jira: OLS-3243
Stacked PR: 2 of 5 — merge after #85
Depends on: #85

Test plan

• 5 unit tests for BarePodManager (Claim, AlreadyExists, Release, Release_NotFound, WaitReady)
• All existing tests pass with updated SandboxProvider interface
• Test fakes updated with SetStep stubs

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📥 Commits

Reviewing files that changed from the base of the PR and between b527722 and 500e020.

📒 Files selected for processing (6)

• controller/proposal/bare_pod_manager.go
• controller/proposal/bare_pod_manager_test.go
• controller/proposal/podspec_builder.go
• controller/proposal/podspec_builder_test.go
• controller/proposal/sandbox.go
• controller/proposal/sandbox_agent_test.go

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@thoraxe: The following test 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/generate	500e020	link	true	/test generate

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