testsuite: Supress stderr when running integration tests
This fixes a problem where test output was leaking into GitHub Actions results (#8419), making the output unnecessarily verbose and harder to read. This makes the test output much cleaner while still preserving all the diagnostic information when tests fail. Also force the test to run sequentially, they fail if you try to run them concurrently. I think that there are probably issues to do with setting the working directory when using cabal-install as a library. Fixes #8419
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