Building the most straightforward tests with GHC Bindist compiled with Hadrian

[GuillaumeGen]

This is using a locally built bindist using Hadrian. This is currently passing 153 of the 206 tests when running bazel test //... --keep_going.

The main identified issues for failing tests are:

• The issue with Cabal dependency calling undeclared splitFileName and minusFileName as described in #1832
• The Hadrian bindist does not distribute a ghci binary. As far as I understood, this should be moved to ghc --interactive to pass tests related to REPL.
• Some header files not found like "ghcplatform.h".
• Some type interfaces changed between GHC 8.10.7 and 9.2.5

[GuillaumeGen]

Might be worth putting the generated bindist somewhere on the internet, to avoid reference to my local file system.

[avdv]

Made some progress:

1. use the official GHC 9.6.1 bindist as this is built with Hadrian
2. fixed a few build problems, so now the ./tests/run-start-script.sh --use-bindists works on CI