Add migration steps when policy is stored in the database

[nblock]

Fixes: #2567

• have read the CONTRIBUTING.md file
• raised a GitHub issue or discussed it on the projects chat beforehand
• added unit tests
• added integration tests
• updated documentation if needed
• updated CHANGELOG.md

[ghost]

Pull Request Revisions

Revision	Description
r3	Database policy storage text corrected Minor text correction in migration notes about database policy storage section
r2	Changelog updated with policy migration details Added migration notes section for database policy storage with minor punctuation refinement in summary heading
r1	Policy migration and SSH rework added Detailed migration notes for database-stored policies and a comprehensive rework of the SSH policy section were introduced

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☑️ AI review skipped for r3

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