[SPARK-45549] Remove unused `numExistingExecutors` in `CoarseGrainedSchedulerBackend`

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 3.5.0
• Fix Version/s: 4.0.0
• Component/s: Spark Core
• Labels: pull-request-available
• Assignee: xiaoping.huang
• Reporter: xiaoping.huang
• Created: 16/Oct/23 10:52
• Updated: 18/Oct/23 15:50
• Resolved: 18/Oct/23 15:49

Issue Links

• links to: GitHub Pull Request #43383