🌱 (catalogd) add more unit tests for localdir storage.Instance

[anik120]

Also rename query to metas in places that were missed by #1703

Description

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.86%. Comparing base (dcf50b8) to head (45cdb37).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
catalogd/cmd/catalogd/main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1713      +/-   ##
==========================================
+ Coverage   67.66%   67.86%   +0.19%     
==========================================
  Files          59       59              
  Lines        4991     4994       +3     
==========================================
+ Hits         3377     3389      +12     
+ Misses       1367     1363       -4     
+ Partials      247      242       -5     

Flag	Coverage Δ
e2e	53.00% <ø> (-0.38%)	⬇️
unit	55.08% <94.44%> (-0.34%)	⬇️

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