Fix linting issues after textile removal

Remove unused imports and variables left over from textile processing:
- Remove unused 'constantFrom' and 'tuple' imports from check-link-is-internal.test.ts
- Remove unused 'inkeepSearchEnabled' parameter from external-scripts/index.ts

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: 2 people

src/external-scripts/index.ts

@@ -66,7 +66,6 @@ const sessionTracker = (
     gtmContainerId,
     headwayAccountId,
     inkeepChatEnabled,
-    inkeepSearchEnabled,
     inkeepApiKey,
     insightsEnabled,
   }: ExternalScriptsData = {},