cmd/go: simplify and document lazy-loading test cases

I decided to add package and module diagrams to the test cases to make
them easier to follow.

While adding those diagrams, I noticed some strong similarities among
a couple of the graphs, so I consolidated those cases (and deleted the
redundant tests).

For #36460

Change-Id: Id6cd04fc871379b83851c2d1af89ea9296a0f3e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/251997
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
7 files changed
tree: ce1756ce8294863ed497921a68f9e73ba0dd5532
  1. .gitattributes
  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/
README.md

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