citrix_workspace: add more features, refactor derivation

In #89806 it has been reported that the final package is missing a lot
of features like support for the self-service GUI and the
config-management.

While working on supporting those components in the Nix-package, I
decided to refactor the package to simplify the entire setup.

This patch changes the following things:

* Binaries and libraries are patched using the `autoPatchelfHook` to
  avoid having unneeded libraries linked (e.g. some programs use gtk2,
  others use gtk3).

* Moved source-declarations into their own file.

* Wrapped `configmgr` and `selfservice` and added those to `$out/bin`.

* Don't mention the old `citrix_receiver`-packages in the manual anymore
  since those packages were removed in 19.09 and are EOLed anyways.

Closes #89806

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