Rename references to mathesar/mathesar-ansible to mathesar-infrastructure

[zackkrida]

Caution

The merge of this PR should be coordinated to be right after the renaming of the repository. Please feel free to review the PR but leave merging for @zackkrida.

This PR renames references to the maintainer-only repository mathesar/mathesar-ansible to mathesar/mathesar-infrastructure to better reflect the contents of that repository.

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[mathemancer]

LGTM, except for one minor, optional change that I suggested.

I saw in the other PR that you have a plan for how to merge this, so I'll leave it to you, @zackkrida