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e71e3e8d - Refresh `BuildDispatch` when running pip install with `--reinstall` (#933)

Refresh `BuildDispatch` when running pip install with `--reinstall` (#933) ## Summary This fixes an extremely subtle bug in `pip install --reinstall`, whereby if you depend on `setuptools` at the top level, we end up uninstalling it after resolving, which breaks some cached state. If we have `--reinstall`, we need to reset that cached state between resolving and installing. ## Test Plan Running `pip install --reinstall` with: ```txt setuptools devpi @ https://files.pythonhosted.org/packages/e4/f3/e334eb4dc930ccb677363e1305a3730003d203efbb023329e4b610e4515b/devpi-2.2.0.tar.gz ``` Fails on `main`, but passes.