Consider reverting default usage of `--enable-documentation` in cabal haddock

I was bitten by #8707 and I had no idea what was going on, had to search the issue tracker to find it.

Looks like now `cabal haddock` will with default settings (i.e. no `documentation: True` in the config file or `--disable-documentation` passed explicitly) lead to rebuild of all dependencies.

What is worse, if someone doesn't want to enable `documentation: True`, there seems to be no way to permanently disable this behavior.

This looks like a quite bad UX change to me.

Can this please be reverted? Or resolved in a better way.

PRs in question:

- https://github.com/haskell/cabal/pull/8259
- #8330

Start by reading #8707 and the referenced PRs #8259 and #8330 to understand why cabal haddock rebuilds dependencies by default and how configuration and command-line options interact. Done means the default behavior and a permanent opt-out are agreed and covered by the relevant tests, though no test or source file is named here.

Written by the indexing model from the issue text.