Move ResVDX_UV_ from condorJobs_reco to config file?

I know this is from Gaelle but on the one hand I am completely confused what is supposed to hapen here syntax wise, while on the other hand we should make the whole `ResVDX_UV_` optional (also below).

It would be nice to be able to specify additional arguments to k4run in the config and then this could go there.

_Originally posted by @Zehvogel in https://github.com/key4hep/k4DetPerformance/pull/3#discussion_r1634939994_

Start by locating condorJobs_reco and the existing k4run invocation, then read the linked pull-request discussion about ResVDX_UV_. Clarify the intended config syntax and optional behavior before changing anything; done means additional k4run arguments can be specified in configuration and ResVDX_UV_ is optional.

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