feat(glossary): surface deprecation badge on glossary term tree

[datahub-akshay]

Summary

• Adds deprecation { ...deprecationFields } to the childGlossaryTerm fragment in glossaryNode.graphql so the glossary sidebar tree query fetches a term's deprecation status
• Renders the existing DeprecationIcon next to a term's name in TermItem.tsx when deprecation.deprecated is true, following the same pattern already used for tags, domains, and data products
• Reuses the isOnEntityPage ? entityData : term fallback already in place for getDisplayName, so the badge reflects live state immediately after deprecating/un-deprecating from the term's own profile page, and falls back to the sidebar-fetched value otherwise

Test plan

• TermItem.test.tsx (new): 7 cases covering deprecated / not-deprecated / null / absent deprecation, plus the live entityData override behavior (shows live state, clears a stale badge, falls back correctly when entityData belongs to a different entity)
• yarn vitest run on the new test file: all passing
• eslint on changed files: clean
• tsc --noEmit: no errors
• GlossaryTerm.deprecation already exists on the backend schema, so no server-side change was needed

Note: glossaryNode.generated.ts is gitignored and not part of this diff; run yarn generate after pulling this branch to pick up the updated fragment types.