DLE config - replace "standby_mode" to "recovery_target" for promotion

Description

Currently the parameter "standby_mode:on" specified in "retrieval.spec.physicalSnapshot.options.promotion.recovery"

• If this parameter is on, the server will not stop recovery when the end of archived WAL is reached, but will keep trying to continue recovery by fetching new WAL segments using restore_command.

I suggest replacing this parameter with "recovery_target: 'immediate'"

• This parameter specifies that recovery should end as soon as a consistent state is reached, i.e., as early as possible. When restoring from an online backup, this means the point where taking the backup ended.

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Checklist

• MR description has been reviewed
• MR changes are functionally tested
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