Efm 4.9 release changes

[EFM-Bobby]

This updates the version examples from 4.8 to 4.9, adds release notes for 4.9, and includes property changes that were made in the efm code for 4.9.

It also removes references to standbys using recovery.conf files since database v11 and lower will no longer be supported.

[github-actions[bot]]

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