feat(ci): run multiple nightly test configurations

[victor-dumitrescu]

What

Expands the NDS Database nightly test matrix from 1 to 20 tests, with varying test parameters (operations / epoch, test cases / epoch).

Why

Expands nightly test coverage to the maximum number of tests that can actually run in parallel on GitHub runners.

Manually Testing

make all

A successful nightly workflow, with tests shortened to 10 minutes here. Each replica runs with a different seed, so test with same parameters are not redundant.

Tasks for the Author

• Link all Linear issues related to this MR using magic words (e.g. part of, relates to, closes).
• Eliminate dead code and other spurious artefacts introduced in your changes.
• Document new public functions, methods and types.
• Make sure the documentation for updated functions, methods, and types is correct.
• Add tests for bugs that have been fixed.
• Explain changes to regression test captures when applicable.
• Write commit messages in agreement with our guidelines.
• Self-review your changes to ensure they are high-quality.
• Complete all of the above before assigning this MR to reviewers.

[github-actions]

Benchmark results for revision 7fc28d1:

Metric	Duration	TPS
Mean	1.51614834s	26.383
Worst	1.526051779s	26.211
Best	1.501902891s	26.633
Standard Deviation	±6.203424ms	±0.108

Full results

Run	Transfers	Duration	TPS
1	40	1.521404871s	26.291
2	40	1.514357998s	26.414
3	40	1.517814165s	26.354
4	40	1.520481597s	26.307
5	40	1.518094679s	26.349
6	40	1.515480397s	26.394
7	40	1.515813271s	26.388
8	40	1.509677761s	26.496
9	40	1.525467944s	26.221
10	40	1.511683096s	26.461
11	40	1.526051779s	26.211
12	40	1.524856101s	26.232
13	40	1.508402017s	26.518
14	40	1.501902891s	26.633
15	40	1.512768382s	26.442
16	40	1.511824614s	26.458
17	40	1.516209567s	26.382
18	40	1.519210181s	26.329
19	40	1.509115797s	26.506
20	40	1.522349693s	26.275

Compare the results above with those for the default branch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.91%. Comparing base (809bddc) to head (e5a3492).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1102      +/-   ##
==========================================
- Coverage   89.92%   89.91%   -0.01%     
==========================================
  Files         135      135              
  Lines       29269    29269              
  Branches    29269    29269              
==========================================
- Hits        26320    26318       -2     
- Misses       2127     2128       +1     
- Partials      822      823       +1     

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