Feat/evidence search

[Harman-singh-waraich]

• adds search functionality for evidence
• Subgraphs have been updated, to have fulltext search

This PR merges into the Evidence Refactor PR #1634

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PR-Codex overview

This PR updates the subgraph schema to include full-text search and enhances the Evidence module UI with search functionality and scroll-to-latest button.

Detailed summary

• Added full-text search feature to subgraph schemas
• Modified Evidence module UI with search and scroll functionality
• Updated SVG icon for arrow-down
• Improved evidence indexing and search queries

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