Remove nodes from Ubergraph-Info payload

[shuchenliu]

The nodes field has been removed from the ubergraph information payload to reduce storage usage and improve fetching time, as node details can be queried directly from the Ubergraph index in Elasticsearch.

[sentry]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../retriever/data_tiers/tier_1/elasticsearch/meta.py	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
...retriever/data_tiers/tier_1/elasticsearch/types.py	94.36% <ø> (-0.08%)	⬇️
.../retriever/data_tiers/tier_1/elasticsearch/meta.py	22.92% <0.00%> (ø)

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