internal/postgres: handle different SymbolMeta for different build contexts

GetSymbolHistory now returns a SymbolHistory type.

SymbolHistory is a map of version to name to SymbolMeta to UnitSymbol.
It takes into account cases where the SymbolMeta may be different for
different build contexts.

For golang/go#37102

Change-Id: I0cf757863d89fa0b95ed3a63ca1bfec6ee033c54
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/316371
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
4 files changed
tree: 67ae55e416e06b12014a27b2ebd9d8aed01c2c25
  1. .dockerignore
  2. .eslintignore
  3. .eslintrc.yaml
  4. .gitignore
  5. .prettierignore
  6. .prettierrc.yaml
  7. .stylelintignore
  8. .stylelintrc.yaml
  9. CONTRIBUTING.md
  10. LICENSE
  11. PATENTS
  12. README.md
  13. all.bash
  14. cloudbuild.yaml
  15. cmd/
  16. content/
  17. devtools/
  18. doc/
  19. e2e/
  20. go.mod
  21. go.sum
  22. internal/
  23. jest.config.js
  24. migrations/
  25. package-lock.json
  26. package.json
  27. third_party/
  28. tsconfig.json
README.md

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