API incompatible with our test suites

This commit introduces a new build-type, Hooks. A package using this
build type should provide a SetupHooks.hs module which exports
a value `setupHooks :: SetupHooks`. This is intended to replace the
Custom setup type. This allows Cabal to have finer-grained information
about the build, instead of having an opaque Setup executable to invoke.

Tests include:

  - error when returning an invalid component diff in a
    per-component pre-configure hook
  - error when declaring pre-build rules whose dependency
    graph contains cycles
  - error when we cannot find a dependency of a pre-build rule
  - warning when there are pre-build rules that are declared but
    never demanded
  - correctness tests for SetupHooks, e.g. that
    pre-build rules are run in dependency order (see the
    `SetupHooksRuleOrdering` test)

This commit makes the library functions in Cabal agnostic of the working
directory. In practice, this means that we distinguish `FilePath`s
from un-interpreted `SymbolicPath`s. The latter may be paths that are
relative to the working directory, and need to be interpreted with
respect to a passed-in argument specifying the working directory,
instead of using the working directory of the current process.
See Note [Symbolic paths] in Distribution.Utils.Path.

In particular, paths in the package description now use the SymbolicPath
abstraction, which allows specifying whether they are allowed to be
absolute, and, if they are relative, what they are relative to.
For example, source files are relative to a source search directory,
data files are relative to the data directory, and doc files are
relative to the package root.

Fixes #9702

* Bump versions on master branch to 3.11

* Try to fix CI by setting cabal-testsuite stable Cabal version to 3.8 back again

* Update bootstrap configuration

* Work around bounds problem with cabal-install-parsers

* Update bootstrap files

* Try to update the Custom setup cabal to 3.10 according to Artem's suggestion

* CI: cabal-3.10 compat: actions/cache has to go before cabal update

* Fix failing old GHC CI builds by adding XDG's ~/.local/bin to GITHUB_PATH

---------

Co-authored-by: Artem Pelenitsyn <a.pelenitsyn@gmail.com>

- regenerate bootstrap plans
- update CI and docker images for 8.8.4 and 8.10.4

The are various motivation points:
- I'm not aware anyone third party running Cabal tests (maybe nixpkgs?)
- No need to do gen-extra-source-files, as Cabal-tests is not distributed
- No multiple rebuilds of Cabal-QuickCheck, Cabal-tree-diff
- Slightly smaller Cabal sdist (which is quite big still)