ci: do not cache test results

[skl]

The recent go cache changes resulted in the test results themselves being cached, meaning that some tests were skipped if the test binary had not changed since the last run.

Bust the cache with -count=1.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.75%. Comparing base (cf582b3) to head (caf5fc2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1360      +/-   ##
==========================================
- Coverage   43.76%   43.75%   -0.02%     
==========================================
  Files         308      308              
  Lines       33495    33495              
==========================================
- Hits        14660    14656       -4     
- Misses      17893    17895       +2     
- Partials      942      944       +2     

Flag	Coverage Δ
integration-test	21.67% <ø> (-0.20%)	⬇️
integration-test-arm	0.00% <ø> (ø)
integration-test-vm-x86_64-5.15.152	?
integration-test-vm-x86_64-6.10.6	?
k8s-integration-test	2.33% <ø> (ø)
oats-test	?
unittests	44.60% <ø> (ø)

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[grcevski]

LGTM!