zoom-us: allow to select xdg-desktop-portal packages

To reduce the closure size of the zoom-us package,
this commit replaces the `xdgDesktopPortalSupport`
option with several new options that permit to (de-)select
several XDG desktop portal packages to be used by `zoom-us`.
Furthermore, two new options permit to inject further packages
(e.g. individual XDG desktop portal packages) into the virtual
filesystem that will be prepared by bubblewrap for zoom-us:

* `targetPkgs` is a *function* that maps the `pkgs`
  packages attrset to a list of packages.
* `targetPkgsFixed` is a simple list of packages.

`targetPkgs` should be preferred before
`targetPkgsFixed` if possible, as the `buildFHSEnv`
mechanism expects a function as explained above:
It needs to extract a list of dependency
packages for a `pkgs` package attrset.
Package injection likely also works if `targetPkgsFixed`
is used, but that creates a liability
in that changes of the `buildFHSEnv` implementation might
(at least more likely) break zoom-us in unexpected ways.

Note: This now *disables* all
XDG desktop portal packages by default.

Co-authored-by: Philip Taron <philip.taron@gmail.com>

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