Fix label migration for branch patterns in submit requirements

Current situation:
The label migration API converts labels with function = MaxWithBlock
into submit requirements. However, branch patterns are currently
migrated by embedding the original branch value directly into the
applicableIf expression.

For example:

[label "rest-authz"]
  branch = refs/heads/*
  function = MaxWithBlock

was migrated to:

[submit-requirement "rest-authz"]
  applicableIf = branch:\\\"refs/heads/*\\\"

Motivation:
This is not a valid Gerrit query expression. While refs/heads/* is a
valid label branch pattern, the branch: operator in submit requirement
expressions expects either an exact branch name or a regular
expression.

Fix:
This change converts branch patterns during migration as follows:

refs/heads/master  -> branch:"refs/heads/master"
refs/heads/*       -> branch:^refs/heads/.*
refs/*             -> branch:^refs/.*
^refs/heads/.*     -> branch:^refs/heads/.*
refs/heads/hi\"ch  -> branch:"refs/heads/hi\"ch"
refs/heads/hi#ch   -> branch:"refs/heads/hi#ch"

As a result, the generated applicableIf expressions are valid and
preserve the semantics of the original label branch restrictions.

NOTE: After migration, When Jgit persists the data into config, it
is persisted with escaping characters.
E.g.
[label "rest-authz-hash"]
branch = "refs/heads/hi#ch"
-> persisted after migration to
[submit-requirement "rest-authz-hash"]
  applicableIf = branch:\"refs/heads/hi\\\"ch\"

But during runtime, it is interpreted as
`branch:"refs/heads/hi\"ch"`

Change-Id: I80aaa87019a9e8412be5e26949cd150c9ffe6515
Release-Notes: Fix label migration for branch patterns in submit requirements
2 files changed
tree: e40967c39d7f8e55a424316fd633339528272506
  1. .agents/
  2. .gemini/
  3. .github/
  4. .settings/
  5. .ts-out/
  6. antlr3/
  7. configs/
  8. contrib/
  9. Documentation/
  10. e2e-tests/
  11. java/
  12. javatests/
  13. lib/
  14. modules/
  15. plugins/
  16. polygerrit-ui/
  17. prolog/
  18. prologtests/
  19. proto/
  20. resources/
  21. tools/
  22. webapp/
  23. .bazelignore
  24. .bazelproject
  25. .bazelrc
  26. .bazelversion
  27. .editorconfig
  28. .git-blame-ignore-revs
  29. .gitignore
  30. .gitmodules
  31. .gitreview
  32. .mailmap
  33. .pydevproject
  34. .zuul.yaml
  35. AGENTS.md
  36. BUILD
  37. COPYING
  38. external_deps.lock.json
  39. INSTALL
  40. Jenkinsfile
  41. MODULE.bazel
  42. MODULE.bazel.lock
  43. package.json
  44. pnpm-lock.yaml
  45. pnpm-workspace.yaml
  46. README.md
  47. SUBMITTING_PATCHES
  48. web-dev-server.config.mjs
  49. yarn.lock
README.md

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