Streamline initialize for drivers

[tokebe]

Shortens initial fail time and lets retries depend on health loop retry instead of a separate retry system

[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 36 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/retriever/utils/backend_client.py	65.30%	13 Missing and 4 partials ⚠️
src/retriever/data_tiers/tier_0/gandalf/driver.py	45.45%	12 Missing ⚠️
...etriever/data_tiers/tier_1/elasticsearch/driver.py	81.25%	1 Missing and 2 partials ⚠️
src/retriever/utils/mongo.py	66.66%	2 Missing ⚠️
src/retriever/utils/redis.py	50.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/retriever/config/general.py	96.06% <100.00%> (ø)
src/retriever/utils/mongo.py	37.97% <66.66%> (+0.82%)	⬆️
src/retriever/utils/redis.py	41.58% <50.00%> (+1.17%)	⬆️
...etriever/data_tiers/tier_1/elasticsearch/driver.py	47.15% <81.25%> (+1.86%)	⬆️
src/retriever/data_tiers/tier_0/gandalf/driver.py	42.85% <45.45%> (+7.91%)	⬆️
src/retriever/utils/backend_client.py	61.34% <65.30%> (+1.06%)	⬆️

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