Use static list of keys in model

[serathius]

Continuation of #19973
PoC for #21133

After improvements in #21488

goos: linux
goarch: amd64
pkg: go.etcd.io/etcd/tests/v3/robustness/validate
cpu: AMD Ryzen Threadripper PRO 3945WX 12-Cores     
                                                               │   old.txt    │               new.txt               │
                                                               │    sec/op    │   sec/op     vs base                │
ValidateLinearizableOperations/SequentialSuccessPuts-24           17.14m ± 3%   15.09m ± 3%  -11.97% (p=0.000 n=10)
ValidateLinearizableOperations/SequentialFailedPuts-24            15.68m ± 2%   10.89m ± 1%  -30.57% (p=0.000 n=10)
ValidateLinearizableOperations/ConcurrentFailedPutsWithRead-24    16.61m ± 2%   12.92m ± 2%  -22.23% (p=0.000 n=10)
ValidateLinearizableOperations/ConcurrentFailedPuts-24            18.42m ± 1%   12.09m ± 3%  -34.38% (p=0.000 n=10)
ValidateLinearizableOperations/BacktrackingHeavy-24              26.638m ± 1%   1.521m ± 1%  -94.29% (p=0.000 n=10)
geomean                                                           18.54m        8.284m       -55.32%

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.46%. Comparing base (be3acf4) to head (458d1cf).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

see 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21486      +/-   ##
==========================================
+ Coverage   68.40%   68.46%   +0.05%     
==========================================
  Files         428      428              
  Lines       35372    35372              
==========================================
+ Hits        24196    24216      +20     
+ Misses       9773     9748      -25     
- Partials     1403     1408       +5     

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@serathius: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-integration-2-cpu-arm64	458d1cf	link	true	/test pull-etcd-integration-2-cpu-arm64
pull-etcd-robustness-arm64	458d1cf	link	true	/test pull-etcd-robustness-arm64

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