[DRAFT] [ART-14440] added migration guide

[pruan-rht]

for ART-14440

[openshift-ci]

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[coderabbitai]

Walkthrough

A migration guide document is added detailing the process for transitioning Jira infrastructure from Server to Atlassian Cloud. The guide covers configuration updates, authentication changes, source code modifications across multiple modules, external data reconfiguration, and testing strategy with a structured checklist and rollback procedures.

Changes

Cohort / File(s)	Summary
Migration Guide Documentation JIRA_CLOUD_MIGRATION.md	New migration guide documenting configuration updates to Jira URL, field ID adjustments for Cloud compatibility, authentication switching to token-based approach, and comprehensive checklist of affected modules and testing requirements

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

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[openshift-ci]

@pruan-rht: 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/security	58a2375	link	false	/test security

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