Commits on Dec 10, 2024

1. kvserver: add TestFlowControlSendQueueRangeSplitMerge test …

   Add a new rac2 flow control integration test,
   `TestFlowControlSendQueueRangeSplitMerge`.
   
   This test takes the following steps:
   
   ```sql
   -- We will exhaust the tokens across all streams while admission is blocked on
   -- n3, using a single 4 MiB (deduction, the write itself is small) write. Then,
   -- we will write a 1 MiB put to the range, split it, write a 1 MiB put to the
   -- LHS range, merge the ranges, and write a 1 MiB put to the merged range. We
   -- expect that at each stage where a send queue develops n1->s3, the send queue
   -- will be flushed by the range merge and range split range operations.``sql
   ```
   
   Note that the RHS is not written to post-split, pre-merge. See the
   relevant comments, this will be resolved via cockroachdb#136649, or some variation,
   which enforces the timely replication on subsume requests.
   
   Also note that epoch leases are used in the test, the added todo
   describes why this is currently necessary and an intention to re-enable
   them.
   
   Part of: cockroachdb#132614
   Release note: None

   

   kvoli committed Dec 10, 2024
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