CAMEL-23274: Enable JaCoCo coverage in SonarCloud PR analysis (#22468)

The SonarCloud PR analysis always reported 0% coverage because the
sonar-build workflow built with -Dquickly (skipping all tests) and
never activated the coverage profile.

Add a second Maven step that runs core module tests with -Dcoverage,
then generates the aggregated JaCoCo report via the coverage module.
All core source modules are included in the reactor so report-aggregate
can map execution data from camel-core tests to their classes.

Also add ContextValueFactory to the JaCoCo multi-release JAR excludes
in coverage/pom.xml (same issue as the existing CamelThreadFactory
exclude).

Tested locally: produces a 12 MB aggregated report with ~63% line
coverage across 2452 classes in 13 core modules.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: gnodet

.github/workflows/sonar-build.yml

@@ -58,6 +58,18 @@ jobs:
       - name: Build with Maven
         run: ./mvnw install -B -Dquickly
 
+      # Run core tests with JaCoCo and generate aggregated coverage report.
+      # The source modules must be in the reactor so report-aggregate can
+      # map execution data from camel-core tests to their classes.
+      # TODO: Once incremental-build.sh supports module detection in the sonar
+      #       workflow, replace the hardcoded -pl with detected affected modules
+      #       to get coverage on components too (see PR #22247).
+      - name: Run tests with coverage and generate report
+        run: >
+          ./mvnw verify -B -Dcoverage
+          -pl core/camel-api,core/camel-util,core/camel-support,core/camel-management-api,core/camel-management,core/camel-base,core/camel-base-engine,core/camel-core-engine,core/camel-core-languages,core/camel-core-model,core/camel-core-processor,core/camel-core-reifier,core/camel-core,coverage
+          -Dmaven.test.failure.ignore=true
+
       - name: Prepare compiled classes artifact
         shell: bash
         run: find . -name "target" -type d | tar -czf target.tar.gz -T -

coverage/pom.xml

@@ -2650,6 +2650,7 @@
                                     <!-- Workaround to multi-release jar https://github.com/jacoco/jacoco/issues/407 -->
                                     <excludes>
                                         <exclude>**/CamelThreadFactory*</exclude>
+                                        <exclude>**/ContextValueFactory*</exclude>
                                     </excludes>
                                 </configuration>
                             </execution>