[2.3.0] Checkmk Werk 16407 created: omd update: Don't Delete "config.pb" During Pre-Update

[//]: # (werk v2) # omd update: Don't Delete "config.pb" During Pre-Update key | value ---------- | --- date | 2024-03-07T13:27:55+00:00 version | 2.3.0b2 class | fix edition | cee component | omd level | 1 compatible | yes The `omd update` command has the capability to undo the changes it has done up until `Verifying Checkmk configuration...`. However, if any change after `Verifying Checkmk configuration...` is persisted. Due to a regression caused by Werk #15725, the file `config.pb` is deleted during this verification. If the update aborts during the verification, then users will see the following error: ``` Starting cmc...Failed (Config /omd/sites/prod_dmz/var/check_mk/core/config.pb missing, run "cmk -U" and try again) ``` With this Werk, `config.pb` will be deleting only while `Updating Checkmk configuration...`.