fix: some issues with program inspector

[zawan-ila]

This PR resolves some issues (introduced in 452) with the ProgramInspector :-

1. If a network request fails for a search, running the same search won't retry the request, as the query state has not changed. We change the query from a string type to object type to circumvent this. This is also in line with the earlier behavior (from before 452)

2. Remove existing search params whenever a new search is made. Not doing this causes older params to linger for a while until the new search updates the params (asynchronously). Depending on the network, this might take some time.

3. Fix the error message when the getProgramEnrollments call "fails" (e.g when searching for a non-existent user).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.92%. Comparing base (99bcbb0) to head (429c225).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #454      +/-   ##
==========================================
+ Coverage   85.91%   85.92%   +0.01%     
==========================================
  Files         185      185              
  Lines        3868     3872       +4     
  Branches      947      948       +1     
==========================================
+ Hits         3323     3327       +4     
  Misses        527      527              
  Partials       18       18              

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