Docs: Reformat v2.0.x-SNAPSHOT connector overview pages and fix connector screenshots

[kiran1287]

Summary

• Fixes all v2.0.x-SNAPSHOT connector screenshots: 256 per-connector Metadata Ingestion images (Select Service / Add New Service Name / Configure Service Connection), across all 10 categories, had been carried over from stale pre-2.0 assets instead of the current ai-2.0 versions. Every image is now sourced from and verified byte-for-byte against docs-collate's ai-2.0 reference images, mirrored under public/images/connector2.0/metadata-ingestion/.
• Rewrites every connector overview page under v2.0.x-SNAPSHOT/connectors/ from the old generic MetadataIngestionUi/Steps component pattern into a fully-written-out single-page format matching Collate's ai-2.0 docs style: inlined six-step Metadata Ingestion content plus a shared per-category "Configure Metadata Agent" section. yaml.mdx and troubleshooting.mdx are untouched for existing connectors.
• Adds two new connectors: Omni, and Prefect — overview, yaml, troubleshooting, docs.json entries, connector-list cards, and homepage integration grid.
• Adds shared metadata-agent snippets per category (database, dashboard, drive, pipeline, api, ml-model, search, storage, messaging, metadata).
• Updates ingestion guide pages: Lineage/Usage workflow docs rewritten for the current Agent-based UI, Spark Lineage documents the native OpenLineage integration (confirmed against the OpenMetadata source, POST /api/v1/openlineage/lineage), Export Lineage documents CSV/PNG/PDF export, Unity Catalog incremental extraction permissions corrected against Databricks' own docs.
• Adds a connector search/filter bar to the v2.0.x-SNAPSHOT connectors landing page.
• Doc-review cleanup: removed leaked Collate-only content (a "Hybrid Ingestion Runner" tip block referencing docs.getcollate.io that had leaked into 20 connector pages), Latin abbreviations, arrow characters in nav paths, missing body sentences after headings.

Test plan

• mint broken-links passes with zero broken links across v1.12.x, v1.13.x, and v2.0.x-SNAPSHOT
• docs.json validated as well-formed JSON
• Every connector's ConnectorDetailsHeader verified byte-for-byte identical between its overview page and yaml.mdx
• Every image reference verified to resolve on disk, and every v2.0.x-SNAPSHOT connector screenshot verified byte-for-byte against docs-collate's ai-2.0 source
• Manual spot-check in mint dev recommended before merge, given the size of this change

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Project	Status	Preview	Updated (UTC)
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[ayush-shah]

[P1] Restore the deleted Google Drive screenshots

This head deletes public/images/connectors/googledrive/add-new-service.png, select-service.png, and service-connection.png, but the unchanged v1.13 page still references all three at googledrive.mdx:71-73. The page will render three broken screenshots even though the documentation-link check passes (it does not validate image existence). Please restore the assets or update the page references before merging.