Optimize pkg integration tests and add a couple new tests #34377
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This pull request adds a couple new tests, and also keeps the pkg database from
being refreshed in every test, restricting refreshes to once per run of the
tests in the PkgTest class.
It also keeps us from unnecessarily running pkg.latest_version on a given
package when we've already done so during a test run, by storing the results in
a global-scope dictionary.