[patch] Add Tekton pipeline support for DB2 migration with PipelineRun template

[jainyjoseph]

Description

This PR adds Python DevOps library support for launching and managing the DB2 migration Tekton pipeline, including a new PipelineRun template and enhanced Tekton utilities.

Changes

New PipelineRun Template

• Template file: src/mas/devops/templates/pipelinerun-db2-migration.yml.j2
  • Jinja2 template for DB2 migration PipelineRun generation
  • Parameterized configuration for namespace, db2ucluster name, backup options
  • Support for IBM entitlement key and custom service accounts
  • Empty workspace configuration for shared configs

Tekton Module Enhancements

• Migration function: Added launchDb2MigrationPipeline() in src/mas/devops/tekton.py
  • Generates PipelineRun from template with provided parameters
  • Creates PipelineRun in mas-pipelines namespace
  • Returns OpenShift console URL for monitoring
  • Integrates with existing launchPipelineRun() infrastructure

Template Parameters
Required:

• db2_action: Fixed to "migrate" for migration workflow
• db2_migration_namespace: Target namespace
• db2_migration_cluster_name: Db2uCluster to migrate
• db2_migration_backup_enabled: Backup toggle (default: true)

Optional (conditionally included):

• db2_migration_cleanup_old_cluster: Cleanup toggle (default: false)
• ibm_entitlement_key: Optional entitlement key
• image_pull_policy: Container image pull policy

Key Features:

• Consistent with existing pipeline templates (install, upgrade, backup, restore)
• Reusable template design for different migration scenarios
• Comprehensive parameter validation
• Integration with existing Tekton pipeline infrastructure
• Returns console URL for easy pipeline monitoring

Test results

You can refer test results in JIRA MASCORE-11096