Add check-hard.yaml example to mimic noSuggests

[DavisVaughan]

Closes #548

@gaborcsardi feel free to take over from here if you'd like to change anything. I've left it as a build matrix even though only 1 flavor is being used because I feel like there may be cases where we want to add some other flavor to the build. Otherwise it could look more like check-release.yaml if we wanted to simplify the matrix.

[DavisVaughan]

Max has requested a name more like check-no-suggests.yaml. I don't have strong feelings either way

[gaborcsardi]

I am going to merge this now as is after renaming it, but we might move "contributed" workflows to a different location in the future, to a different directory or repository, mainly to make it clear that they are not regularly tested.

[codecov-commenter]

Codecov Report

Merging #549 (236ce20) into v2-branch (58a65c1) will not change coverage.
The diff coverage is n/a.

❗ Current head 236ce20 differs from pull request most recent head 06c390c. Consider uploading reports for the commit 06c390c to get more accurate results

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  Hits              10        10           

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[gaborcsardi]

Thanks a lot!

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