Enable cross version testing for moduleapi tests

[hpatro]

Fixes: #1654

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.94%. Comparing base (e7dbce3) to head (79f995e).
Report is 1 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1655      +/-   ##
============================================
- Coverage     70.94%   70.94%   -0.01%     
============================================
  Files           121      121              
  Lines         65225    65225              
============================================
- Hits          46276    46273       -3     
- Misses        18949    18952       +3     

see 11 files with indirect coverage changes

[zuiderkwast]

Yeah, embarrassing we missed enabling it in the first PR. :)

Now we can see this in the CI job output:

[ok]: set up cluster (206 ms)
[ok]: Send cluster message via module from latest to other server (5 ms)
[ok]: Send cluster message via module from other server to latest (2 ms)

https://github.com/valkey-io/valkey/actions/runs/13119842270/job/36602987372?pr=1655#step:6:285

Looks good!

[zuiderkwast]

And the light-weight one is even faster:

[ok]: Cluster module send message API - VM_SendClusterMessage (1 ms)