Fix number of operations is more than the key pool size

[serathius]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

Fixes

[        30.379] [robustness/singleton_driver_traffic] [err] panic: GetKeysForMultiTxnOps: number of operations is more than the key pool size
[        30.379] [robustness/singleton_driver_traffic] [err] goroutine 184 [running]:
[        30.379] [robustness/singleton_driver_traffic] [err] go.etcd.io/etcd/tests/v3/robustness/traffic.(*keyStore).GetKeysForMultiTxnOps(0xc000470f40, {0xc00059f488, 0x4, 0x0?})
[        30.380] [robustness/singleton_driver_traffic] [err] 	/build/tests/robustness/traffic/key_store.go:77 +0x485
[        30.381] [robustness/singleton_driver_traffic] [err] go.etcd.io/etcd/tests/v3/robustness/traffic.etcdTrafficClient.pickMultiTxnOps({{0xa, {0x1b6f760, 0x7, 0x7}, 0x1c20, 0x8001}, 0xc000470f40, 0xc000254288, 0xc0005061e0, {0x14e94d8, ...}, ...}, ...)
[        30.381] [robustness/singleton_driver_traffic] [err] 	/build/tests/robustness/traffic/etcd.go:367 +0x62a
[        30.382] [robustness/singleton_driver_traffic] [err] go.etcd.io/etcd/tests/v3/robustness/traffic.etcdTrafficClient.Request({{0xa, {0x1b6f760, 0x7, 0x7}, 0x1c20, 0x8001}, 0xc000470f40, 0xc000254288, 0xc0005061e0, {0x14e94d8, ...}, ...}, ...)
[        30.382] [robustness/singleton_driver_traffic] [err] 	/build/tests/robustness/traffic/etcd.go:272 +0x9db
[        30.383] [robustness/singleton_driver_traffic] [err] go.etcd.io/etcd/tests/v3/robustness/traffic.etcdTraffic.RunTrafficLoop({0xa, {0x1b6f760, 0x7, 0x7}, 0x1c20, 0x8001}, {0x14eccd0, 0x2b41e20}, 0xc000254288, 0xc0005061e0, ...)
[        30.383] [robustness/singleton_driver_traffic] [err] 	/build/tests/robustness/traffic/etcd.go:159 +0x316
[        30.383] [robustness/singleton_driver_traffic] [err] main.simulateTraffic.func1(0xc000254288)
[        30.383] [robustness/singleton_driver_traffic] [err] 	/build/tests/antithesis/test-template/robustness/traffic/main.go:140 +0x238
[        30.383] [robustness/singleton_driver_traffic] [err] created by main.simulateTraffic in goroutine 163
[        30.383] [robustness/singleton_driver_traffic] [err] 	/build/tests/antithesis/test-template/robustness/traffic/main.go:136 +0x38b

In Antithesis we just run 3 clients, which is lower than number of operations in the MultiOpTxn which requires 4 keys being used.
/assign @ahrtr

[serathius]

Failure in https://linuxfoundation.antithesis.com/report/16hqkvepvi7E38NRP_w86bfZ/gTbjLU_uCKhrobttuUXRzCIwviRAWDb6B1J2pSLmfi4.html?auth=v2.public.eyJzY29wZSI6eyJSZXBvcnRTY29wZVYxIjp7ImFzc2V0IjoiZ1RiakxVX3VDS2hyb2J0dHVVWFJ6Q0l3dmlSQVdEYjZCMUoycFNMbWZpNC5odG1sIiwicmVwb3J0X2lkIjoiMTZocWt2ZXB2aTdFMzhOUlBfdzg2YmZaIn19LCJuYmYiOiIyMDI1LTA1LTI3VDA4OjAzOjI4Ljk4ODI5MDI1OFoifbCC1JQ3pjJYyteK7XYHaXWgSoM21nR6Gk1ifEawcED8x_ZimkPoYsH-NwInxIpF2aRPpYgjOJ_rU7VgDTGM1gU#/run/32413e6d9baa65d3fa1deaed1db0b4f3-31-8/finding/f73e43ef2f2a3dfcc7d8d6989178ae0f8fbf0f16

[serathius]

/cc @joshjms

[joshjms]

Ah, makes sense, lgtm

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