[MIGRATE] Fix edge case bugs with az migrate local replication init & new commands

[saifaldin14]

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[yonzhan]

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[github-actions]

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[Copilot]

Pull request overview

This PR increments the migrate extension beta version and addresses edge cases in Azure Migrate local replication initialization and “new” replication flows, especially around fabric agent (DRA) selection behavior.

Changes:

• Bump extension version to 3.0.0b4 and add a corresponding HISTORY entry.
• Improve fabric agent (DRA) selection to support case-insensitive appliance matching and to optionally proceed when the DRA is non-responsive but in Succeeded provisioning state.
• Add/extend unit tests for get_fabric_agent edge cases (non-responsive + provisioning state, case-insensitive match, no match).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/migrate/setup.py	Version bump to 3.0.0b4.
src/migrate/HISTORY.rst	Add release notes for 3.0.0b4.
src/migrate/azext_migrate/helpers/replication/init/_setup_policy.py	Update get_fabric_agent selection logic and diagnostics.
src/migrate/azext_migrate/helpers/replication/new/_process_inputs.py	Update source/target DRA selection logic and error messages for “new” flow.
src/migrate/azext_migrate/tests/latest/test_migrate_commands.py	Add test coverage for new get_fabric_agent behaviors.

[github-actions]

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[azclibot]

[Release] Update index.json for extension [ migrate-3.0.0b4 ] : https://dev.azure.com/msazure/One/_build/results?buildId=156422676&view=results