Increase the HZ to make test more reliable

[madolson]

After introducing, #1387, we saw a significant increase in other spurious wakeups because of the client cron that was added, which affected the "instantaneous eventloops per second" metric (showing it higher than before". All I did was increase the server hz to get more samples and increase the target value. This seems to work more consistently now. I also removed retries since the instantaneous value isn't dependent on number of retries.

Additionally, assert_lessthan $value [expr $retries*22000] makes no sense to me. The value is usually around 30-100us, since all it's doing is waking up and running a little bit of cron. The retries doesn't make much sense, since the retries don't impact the instantaneous value. I just removed the retries and left the 22k value for now, maybe valgrind is slow.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.03%. Comparing base (8d8ce19) to head (a973681).
Report is 5 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1680      +/-   ##
============================================
- Coverage     71.05%   71.03%   -0.03%     
============================================
  Files           121      121              
  Lines         65243    65254      +11     
============================================
- Hits          46357    46350       -7     
- Misses        18886    18904      +18     

see 12 files with indirect coverage changes

[zuiderkwast]

Still flaky. I got this failure right now:

*** [err]: stats: instantaneous metrics in tests/unit/info.tcl
Expected '194' to be less than '150' (context: type eval line 11 cmd {assert_lessthan $value 150} proc ::test)

https://github.com/valkey-io/valkey/actions/runs/13201529468/job/36854504972?pr=1685#step:5:6269

[madolson]

Expected '194' to be less than '150' (context: type eval line 11 cmd {assert_lessthan $value 150} proc ::test)

Must be missing something else than, because that is way higher than should be possible. EDIT: I'm totally missing something, I misunderstood how the clients cron work. The value should be less than 200.

[zuiderkwast]

What's the formula for the clients cron? Let's add a code about it in this test case when you've figured it out.