chore: reduce number of pods in ppnd test

[juliev0]

Modifications

We don't need so many pods running for this test, and it seems like it can overwhelm the test (at least while attempting to use version 1.5.x of numaflow).

Verification

N/A

Backward incompatibilities

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.01%. Comparing base (5ff1a65) to head (9f44944).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #825      +/-   ##
==========================================
+ Coverage   70.96%   71.01%   +0.04%     
==========================================
  Files          50       50              
  Lines        8341     8341              
==========================================
+ Hits         5919     5923       +4     
+ Misses       1757     1755       -2     
+ Partials      665      663       -2     

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