Optimistically exclude prereleases from initial resolution #6246
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What was the end-user or developer problem that led to this PR?
Sometimes, resolution may end up choosing a prerelease version, but normally end users do not want prereleases at all, unless they explicitly request them.
What is your fix for the problem, implemented in this PR?
Do an optimistic first pass that resolves without prereleases. This should work in most cases, since normally resolutions don't need prereleases. Only if that fails, do a second pass considering prereleases.
This should also speed up most resolutions, since the search space is greatly reduced by default. As an example, Rails has 437 releases as of today, and 162 of them are prereleases.
Fixes #6226.
Make sure the following tasks are checked