* Add back whitespace workflow

(cherry picked from commit 265f1493)

* Whitespace conventions in contributing

(cherry picked from commit 7c9346bf)

* Fix whitespace in workflows

(cherry picked from commit c31ca12e)

# Conflicts:
#	.github/workflows/validate.yml

* Fix whitespace in docs

(cherry picked from commit 2ea012eb)

* Fix whitespace in *.hs sources

(cherry picked from commit e420bf25)

* Add missing line at EOF for cabal-testsuite/**/*.hs

- Fix whitespace in cabal-testsuite + other tests

(cherry picked from commit e386a13c)

* Fix whitespace in fourmolu configuration

(cherry picked from commit b790751c)

* Configure fix-whitespace to include *.project

Needed for POSIX compliance for text files

(cherry picked from commit ed4c36a2)

* Fix whitespace in *.project

(cherry picked from commit 38eb1e82)

* Ignore generated doc/buildinfo-fields-reference.rst

(cherry picked from commit b414fafc)

* Reduce double space between prose words

Co-authored-by: brandon s allbery kf8nh <allbery.b@gmail.com>
(cherry picked from commit 834e1ed6)

* Use fix-whitespace-action

(cherry picked from commit eb87ffdf)

* Fix merge conflict

---------

Co-authored-by: Phil de Joux <philderbeast@gmail.com>
Co-authored-by: Hécate <Kleidukos@users.noreply.github.com>