Fix reloading of plugins registering dynamic items

When change Ia7ed2a06ec3 refactored the `Plugin` hierarchy by
introducing different plugin specifications, omitted to inherit the
`reloadableHandles` from the parent class and instead, introduced a new
`reloadableHandles` variable in the `JarPlugin` implementation.

This caused the `Plugin.getReloadableHandles()` to always return an
empty list, effectively preventing the reloading of the plugin from
replacing existing reloadable bindings [1] and creating new ones
instead.

Whilst this still allows the `reload` to succeed, it misses the removal
of the registration handle associated with the old plugin instance,
which will then not be de-registered if the new plugin is disabled later
on.

Inherit `reloadableHandles` from the parent `Plugin` class so that
addition and retrieval of reloadable registration handles targets the
same instance variable, allowing the reload to move existing dynamic
registration handles to the new plugin instance, rather than creating a
new one.

[1] https://gerrit.googlesource.com/gerrit/+/refs/heads/stable-3.8/java/com/google/gerrit/server/plugins/PluginGuiceEnvironment.java#305

Bug: Issue 346618790
Release-Notes: Fix reload of plugins causing incorrect deregistration of dynamic items
Change-Id: I13896cf1fcabebc26d465aec7c8debc9dddb11be
2 files changed
tree: 375ebb214b5ce72e7720610101973129ef266246
  1. .settings/
  2. .ts-out/
  3. antlr3/
  4. contrib/
  5. Documentation/
  6. e2e-tests/
  7. java/
  8. javatests/
  9. lib/
  10. modules/
  11. plugins/
  12. polygerrit-ui/
  13. prolog/
  14. prologtests/
  15. proto/
  16. resources/
  17. tools/
  18. webapp/
  19. .bazelignore
  20. .bazelproject
  21. .bazelrc
  22. .bazelversion
  23. .editorconfig
  24. .git-blame-ignore-revs
  25. .gitignore
  26. .gitmodules
  27. .gitreview
  28. .mailmap
  29. .pydevproject
  30. .zuul.yaml
  31. BUILD
  32. COPYING
  33. INSTALL
  34. Jenkinsfile
  35. package.json
  36. README.md
  37. SUBMITTING_PATCHES
  38. version.bzl
  39. web-dev-server.config.mjs
  40. WORKSPACE
  41. yarn.lock
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