Optimize catalog query: do not order when computing totals

[javitonino]

This removes the ORDER BY clause when computing totals/facets. It's completely unnecessary there (no need to sort if we are just interested in the count) and it can mess with the optimizer in bad ways (making it prefer the index for the sort rather than the order for the filter). This is responsible for all the recent p99 outliers.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.14%. Comparing base (0ad193b) to head (de4d6f2).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2959      +/-   ##
==========================================
+ Coverage   84.01%   84.14%   +0.12%     
==========================================
  Files         487      487              
  Lines       35972    35979       +7     
  Branches    10966    10966              
==========================================
+ Hits        30222    30273      +51     
+ Misses       5224     5180      -44     
  Partials      526      526              

Flag	Coverage Δ
nidx	77.54% <ø> (ø)
nucliadb	76.05% <100.00%> (+0.26%)	⬆️
nucliadb-ingest	40.67% <16.66%> (-0.02%)	⬇️
nucliadb-reader	42.06% <16.66%> (-0.02%)	⬇️
nucliadb-search	45.04% <75.00%> (+0.01%)	⬆️
nucliadb-standalone	46.17% <16.66%> (-0.02%)	⬇️
nucliadb-train	44.77% <16.66%> (-0.02%)	⬇️
nucliadb-writer	46.83% <16.66%> (-0.04%)	⬇️
nucliadb_dataset	55.45% <ø> (ø)
nucliadb_models	84.27% <ø> (ø)
nucliadb_sdk	93.01% <ø> (ø)
nucliadb_telemetry	86.53% <ø> (ø)
nucliadb_utils	84.17% <ø> (ø)

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