In order to make it easier to run tests this change adds a
collectRunComponents function (like collectComponents but
with it returns the `passthru.run` derivation for each component).

This change also disables `checkPhase` for all components to avoid
running the tests twice.  To run a test or benchmark you now have to
use the the `passthru.run` derivation.

Co-Authored-By: Rodney Lorrimar <rodney.lorrimar@iohk.io>

caches `configure-flags`, `cabal.config`, and `ghc-environment` files
per library in the nix store, so the `make-config-files` script just has
to append them into the same named files for the package being built

instead of using `ghc-pkg dump` and `ghc-pkg register` for each
dependency, copies the `.conf` files from the dependencies
`package.conf.d` directory and then uses a single `ghc-pkg recache`

eliminate the call of `ghc-pkg check`

suppress some output of `ghc-pkg` (not related to speed improvements,
I'm flexible on rolling this bit back)

in my tests, the make-config-files scripts now only take seconds, even
for packages that have many many dependencies - prior to this change,
this script took more than a minute for such packages

This is what most people will want and it means using collecting all the
derivations with `release-lib.nix` will work without having to filter
out `exes` and `benchmarks`.

… hkm/performance-fixes

…fixes

`normalizeRelativeDir` adds a slash on to the end of `dataDir`.
Adding another one here results in `//` and files are left out by
mistake.