[8.19] Fix TEST ThreadPoolMergeExecutorServiceDiskSpaceTests testUnavailableBudgetBlocksNewMergeTasksFromStartingExecution failing #132269
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Avoid mocking merge tasks as backlogged (which are then re-enqueued) because it makes the merge task's queue available budget value unsteady, which breaks the test when it later schedules merge tasks that are under/over budget.
Closes #130205 #131982 #132266
Backport of #132020