Exclude CI job 8.10.7 on Windows that corrupts all CI

This reverts commit cd7a9128.

It's not needed any more, probably, because another workaround
fixes CI differently, probably. As long as it's deterministic enough...

Bump package process dependency version to 1.6.15.0 and move from Cabal to cabal-install

In this way we no longer enforce the fixed process in our own
tools (except cabal-install) and third-party tools using Cabal
the library, but given the possibility of deps conflicts,
this less intrusive approach may be better.

Fix compilation on old GHCs (fixes #8371)

in case past GHC users find the warnings helpful.

Turn off DeterministicTrivial test (see #8356)

pretty-print run targets on failure 

When generating `Paths` modules, define functions when used

The functions `splitFileNAme` and `minusFileName` are now defined in the
same conditional block, ensuring that they cannot be used without being
defined.
This fix a bug occurring when generating a Paths_ module with
--enable-relocatable.

* Turn off T3827 for new GHCs due to heisenbugs not caused by cabal

* Disable the test totally on Linux until we stop taking GHC from GHA

See https://github.com/haskell/cabal/issues/8032#issuecomment-1204113187

* It failed on OSX now, so let's disable it everywhere except on Windows

Who would have thought.

* Give an example for `--enable-nix` flag

* fixup! Give an example for `--enable-nix` flag

* fixup! Give an example for `--enable-nix` flag

* Add `cabal get` documentation

* Add `cabal upload` documentation

* Add `cabal info` documentation

* Add `cabal fetch` documentation

* Add `cabal init` documentation stub

* Add `cabal list` documentation

* Add `cabal report` documentation

* Add `cabal user-config` documentation

* Add changelog for #8309

* Document alternatives to `cabal fetch`

Fixup headers of 3.8.1.0 release notes

Prepare 3.8.1.0 release on master

* Accept unknown future GHCs in the argument filtering code

* Add changelog

Co-authored-by: Mikolaj Konarski <mikolaj@well-typed.com>

Co-authored-by: Mikolaj Konarski <mikolaj@well-typed.com>

* (cabal check) Add typed errors

* hlint Distribution.PackageDescription.Check

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* Warn about packages default value

* Use double backquotes

* Syntax correction

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Fixes #8254

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

cabal init -n: avoid extra blank lines