Revert code-analysis and jacoco infrastructure (PR-G #15686, PR-H #15687)

Continues shrinking the PR-A review surface by reverting the portions of
this branch split into standalone PRs against 8.0.x, matching the
established B/C/D/E revert pattern. Once these land on 8.0.x and 8.0.x is
merged back into this branch, the reverted changes return through the
merge, so the final state of stage-hibernate7 is unchanged - only the
diff visible on PR-A is reduced.

Reverted content:

  grails-code-analysis convention plugin (PR #15686, PR-G)
    GrailsCodeAnalysisPlugin/Extension, GrailsViolationAggregationPlugin
    (+specs), the codeanalysis workflow, the pmd ruleset resource, the
    codenarcFix improvements and config relocation in GrailsCodeStylePlugin,
    spotbugs/pmd build deps, and the grails-code-analysis apply-line across
    all modules (incl. the h7 clones).

  grails-jacoco convention plugin (PR #15687, PR-H)
    GrailsJacocoPlugin (+spec), the coverage workflow, and the
    grails-jacoco apply-line across all modules (incl. the h7 clones).

NOT reverted (intentionally kept):
  - The codenarc violation fixes (f18465a) - reverting would
    re-introduce style violations; they are plugin-independent.
  - All hibernate7 BOM/clone content (the actual PR-A work).

Verified: ./gradlew help configures the root, grails-gradle, and
grails-forge builds; :build-logic-root:build-logic:test passes.

Assisted-by: claude-code:claude-4.7-opus

Author: jamesfredley