Add Notion page to floating-pages-exceptions

Mirror the fix Shaun applied on PR #6141 (commit 7d6c2bb): add the new
integration page path to plugins/floating-pages-exceptions.txt so the
floating-pages validator skips it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Alex Francoeur

plugins/floating-pages-exceptions.txt

@@ -13,3 +13,4 @@ operations/utilities/clickhouse-keeper-http-api.md
 cloud/features/backups/faq.md
 interfaces/web-terminal
 operations/query-rules
+integrations/tools/data-integration/notion/index.md