Limit stored responses; optimize status poll

[tokebe]

• Since humans rarely look at /asyncquery_status, logs are left out to avoid log retrieval overhead.
• Responses are now only stored to a proportion, given that clients are not expected to retrieve responses outside of normal http response or async callback, we can limit storage to a sample for debugging purposes.

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/retriever/utils/mongo.py	20.00%	4 Missing ⚠️
src/retriever/query.py	33.33%	1 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
src/retriever/config/general.py	96.29% <100.00%> (+0.05%)	⬆️
src/retriever/utils/logs.py	45.87% <ø> (ø)
src/retriever/query.py	72.66% <33.33%> (+18.37%)	⬆️
src/retriever/utils/mongo.py	36.18% <20.00%> (-0.07%)	⬇️

... and 1 file with indirect coverage changes

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