### Description
- sets up a Makefile target for running ormolu to format and check source code
- updates CI to run ormolu instead of stylish-haskell (and to check instead of format actively)
Compare #1679.
Here's the plan for merging this:
1. merge this PR; at this point, all PRs will fail CI unless they have the `ignore-server-format-checks` label set
2. merge follow-up PR #2404 that does nothing but actually reformats the codebase
3. tag the merge commit as `post-ormolu` (also on `graphql-engine`, for the benefits of community contributors)
4. provide the following script to any devs in order to update their branches:
```
$ git checkout my-feature-branch
$ git merge post-ormolu^
$ make format
$ git commit -a -m "reformat with ormolu"
$ git merge -s ours post-ormolu
```
(I'll put this in the commit message)
https://github.com/hasura/graphql-engine-mono/pull/2020
Co-authored-by: Philip Lykke Carlsen <358550+plcplc@users.noreply.github.com>
Co-authored-by: Swann Moreau <62569634+evertedsphere@users.noreply.github.com>
GitOrigin-RevId: 130f480a6d79967c8d045b7f3a6dec30b10472a7
