test: verify node registration before scheduling

[0rlych1kk4]

Adds regression coverage for the node-added scheduling path.

The test verifies that a newly added node is registered with NodeWorkerManager before ScheduleManager.createScheduleFutureForNode() is called.

This protects the ordering required to avoid scheduling a node before worker state has been initialized.

Related to #1754.

Test:
mvn -pl core.impl -am -Dtest=TestNodeLifecycleHandler -Dsurefire.failIfNoSpecifiedTests=false test

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.67%. Comparing base (9f4bd4e) to head (c8d3f3a).
⚠️ Report is 547 commits behind head on master.
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Additional details and impacted files

@@              Coverage Diff              @@
##             master    #1769       +/-   ##
=============================================
- Coverage     77.45%   60.67%   -16.78%     
- Complexity     1308     1691      +383     
=============================================
  Files           135      224       +89     
  Lines          5566     9729     +4163     
  Branches        579      920      +341     
=============================================
+ Hits           4311     5903     +1592     
- Misses         1062     3508     +2446     
- Partials        193      318      +125     

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