internal/proxydatasource: support incompatible modules in GetLatestMajorVersion

Currently, GetLatestMajorVersion uses v2 as a base when searching for
latest major versions. This fails to find major versions for
incompatible modules that jump directly from mod/path to mod/path/vN
where N > 2.

To avoid that, update GetLatestMajorVersion to use module's current
version as a base instead.

Add a test case with an incompatible module.

Fixes golang/go#42922

Change-Id: I660d76c3cddf420b85c25b8e7c9f425ba712824c
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/277472
Reviewed-by: Julie Qiu <julie@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
2 files changed
tree: 14f15a55e00b554a8abf0f9db54a4c1b09dffb07
  1. cmd/
  2. content/
  3. devtools/
  4. doc/
  5. internal/
  6. migrations/
  7. third_party/
  8. .dockerignore
  9. .gitignore
  10. .prettierignore
  11. .prettierrc.yaml
  12. all.bash
  13. cloudbuild.yaml
  14. CONTRIBUTING.md
  15. go.mod
  16. go.sum
  17. LICENSE
  18. package-lock.json
  19. package.json
  20. PATENTS
  21. README.md
README.md

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