CI: add job to run tests under minimum supported rust version (msrv) #11737
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Summary
This change adds a GitHub Actions CI job to check that the project builds and test pass under the declared minimum supported rust compiler. I have bumped the msrv to 1.74 as that is the lowest version I could get this project to build on.
Test Plan
The CI job has run on this PR, and will also run on the main branch.