add background fetch to log + background fetch respects git defaults

[mithom]

• adds a log entry for background fetches as they are git commands being run by user configuration of the application.
• in background fetches there is no possibility to choose between with or without tags. This needs to either be a user configuration, or use the 'tagOpt' git configuration (which it does by default when not specifying an option). To achieve this we need a third value for noTags, namely default. i introduced this through a nullable value with null being the 3th value.

possible changes to this PR:

• split the commit into 2 commits/PR's (but since it's so small i thought it wouldn't be an issue)
• introduce an enum instead of using null as a value
• make a repo or global configuration for the noTags in the background fetch.

if you want any of the mentioned changes (or any other), please let me know.

[mithom]

the failed task is due to a timeout on the fetching of 'actions/download-artifact@v4'
and is not specific to this PR

[love-linger]

I've pushed my implementation of this feature.