CAMEL-20199: Add JMX support for virtual thread executors

[gnodet]

Summary

• Virtual thread executors (ThreadPerTaskExecutor) were silently skipped from JMX registration because LifecycleStrategy.onThreadPoolAdd only accepted ThreadPoolExecutor
• Added overloaded onThreadPoolAdd/Remove(ExecutorService) default methods to LifecycleStrategy, ManagementObjectStrategy, and ManagementObjectNameStrategy for backward compatibility
• Created ManagedVirtualThreadExecutorMBean interface and ManagedVirtualThreadExecutor implementation exposing basic attributes (id, sourceId, routeId, isVirtualThread, isShutdown)
• Updated BaseExecutorServiceManager to notify lifecycle strategies for non-ThreadPoolExecutor instances
• Updated JmxManagementLifecycleStrategy and DefaultManagementObjectStrategy to handle ExecutorService registration/unregistration

Test plan

• New ManagedVirtualThreadExecutorTest verifies virtual thread executor MBeans are registered in JMX with correct attributes (JDK 21+)
• Existing ManagedThreadPoolTest, ManagedThreadPoolWithIdTest, ManagedThreadPoolProfileTest, DualManagedThreadPoolWithIdTest, DualManagedThreadPoolProfileTest all pass
• CI validation

🤖 Generated with Claude Code

[github-actions]

🌟 Thank you for your contribution to the Apache Camel project! 🌟
🤖 CI automation will test this PR automatically.

🐫 Apache Camel Committers, please review the following items:

• First-time contributors require MANUAL approval for the GitHub Actions to run
• You can use the command /component-test (camel-)component-name1 (camel-)component-name2.. to request a test from the test bot although they are normally detected and executed by CI.
• You can label PRs using build-all, build-dependents, skip-tests and test-dependents to fine-tune the checks executed by this PR.
• Build and test logs are available in the summary page. Only Apache Camel committers have access to the summary.

⚠️ Be careful when sharing logs. Review their contents before sharing them publicly.

[davsclaus]

Run [[ -z $(git status --porcelain) ]] || { echo 'There are uncommitted changes'; git status; echo; echo; git diff; exit 1; }
There are uncommitted changes
HEAD detached at pull/21701/merge
Changes not staged for commit:
(use "git add ..." to update what will be committed)
(use "git restore ..." to discard changes in working directory)
modified: dsl/camel-endpointdsl/src/generated/java/org/apache/camel/builder/endpoint/dsl/SedaEndpointBuilderFactory.java
modified: dsl/camel-endpointdsl/src/generated/java/org/apache/camel/builder/endpoint/dsl/StubEndpointBuilderFactory.java