feat(x2a): K8s jobs real implementation - framework + init

[elai-shalev]

Overview

This PR implements real Kubernetes job creation for the X2A migration plugin, enabling the init phase to run x2a migration jobs on Kubernetes with full git flow.

Key Changes

1. New Job Script Template (templates/x2a-job-script.sh)

• Complete bash script for executing x2a tool phases (init, analyze, migrate)
• Clones source/target git repos, runs x2a tool, commits results, and pushes to target repo
• Includes callback to Backstage backend with artifact URLs on completion

2. JobResourceBuilder Enhancements

• buildProjectSecret() - Creates K8s secrets for LLM + AAP credentials (long-lived)
• buildJobSecret() - Creates ephemeral K8s secrets for git credentials (auto-deleted with job)
• buildJobSpec() - Builds complete K8s Job spec with init container for git clone
• Git fetch init container using alpine/git image
• Main container executes the x2a-job-script.sh template

3. Router Updates

• POST /projects/:projectId/run - Creates and launches init phase K8s jobs
• POST /projects/:projectId/modules/:moduleId/run - Creates jobs for analyze/migrate/publish phases
• GET /projects/:projectId/modules/:moduleId/log - Retrieves job logs (from K8s or DB)
• POST /projects/:projectId/modules - CRUD endpoint for modules (temporary for testing)

4. Database Service Additions

• Module CRUD operations (createModule, getModule, listModules, deleteModule)
• Job tracking with k8sJobName, callbackToken, and artifacts
• listJobsForProject() and listJobsForModule() queries

5. KubeService

• Added getJobLogs() for fetching logs from running K8s jobs

TODOs

• Implement real job creation for non-init phases - Currently analyze/migrate/publish phases have the skeleton infrastructure but need to be fully wired up
  with actual x2a tool integration
• Implement /collectArtifacts callback endpoints - These endpoints need to be created to receive callbacks from completed K8s jobs with artifact URLs and update job status in the database
• Publish phase needs changes in the x2a code

https://issues.redhat.com/browse/FLPATH-3086

[rhdh-gh-app]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @red-hat-developer-hub/backstage-plugin-x2a-backend

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@red-hat-developer-hub/backstage-plugin-x2a-backend	workspaces/x2a/plugins/x2a-backend	none	v1.0.0

[mareklibra]

Just for heads-up:
Do we want to commit everything? Including temporary data like the checklist?
Or should we focus on the artifacts only?

Can be good for debugging but messy otherwise.

[elai-shalev]

We could commit less, but we need to decide what the user should see and approve, and what not
lets discuss separately on what would be included

[sonarqubecloud]

Quality Gate failed

Failed conditions
7.5% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud

[mareklibra]

LGTM.
@eloycoto can you please have a look as well?