Update analysis results file version to 2.0
We added a new field to the analysis results file format in #26673 (moved), but we did not yet increment the format version number. The current version field is a floating point number, which doesn't work well for versioning. We should use a version string here. Given that this change alone is going to be backward-incompatible, we'll have to call the new version 2.0. I'm preparing a patch.
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