[minor] ODH to RHOAI migration for Maximo AI Service

[Divyesh-Khokhar]

Description

Refactor aiservice_odh and aiservice_rhoai roles to use action-based dispatching pattern (install/uninstall) instead of separate migration role. This consolidates migration logic into RHOAI installation and enables platform switching scenarios.

Architecture Refactoring

• Action-Based Pattern: Restructured both aiservice_odh and aiservice_rhoai roles to support install/uninstall actions.
• Self-Contained Migration: RHOAI role's install action automatically detects ODH and performs migration

This PR is a prerequisite for these two PRs.

• [patch] Add ODH to RHOAI migration parameter to PipelineRun template python-devops#242
• [minor] Add ODH to RHOAI migration support for mas update cli#2133

Test Results

• Tested this role in Ai service installed cluster with ODH.
  After migration:

• Action based:

• ODH Detection/Uninstall:

• RHOAI Install:

Related Jira

• https://jsw.ibm.com/browse/MASAIB-1928

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[karol-czarnecki]

lgtm