Tier 1 Better Metadata Validating and Handling

[shuchenliu]

Solving #116, where an older version of metadata would cause the entire retrieval process to fail on KeyError.

Solving #45 tier1 portion, by enabling the use of bypass_cache flag with get_metadata and its underlying methods. This flag is also internally used when the stale metadata is retrieved from cache for operation generation and a remote refetch is deemed necessary.

[sentry]

Codecov Report

❌ Patch coverage is 20.00000% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...etriever/data_tiers/tier_1/elasticsearch/driver.py	23.07%	10 Missing ⚠️
.../retriever/data_tiers/tier_1/elasticsearch/meta.py	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
.../retriever/data_tiers/tier_1/elasticsearch/meta.py	22.92% <0.00%> (ø)
...etriever/data_tiers/tier_1/elasticsearch/driver.py	43.87% <23.07%> (-2.02%)	⬇️

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