Fix big schema rendering behavior in schema designer.

[aasimkhan30]

Pull Request Template – vscode-mssql

Description

1. This PR enables an option in react flow component for schema designer to only render visible nodes. Helps in render times and overall responsiveness for the component.

Due to this change, I had to change the find node functionality from being event based to a having the query text stored in context.

As it was event based, unrendered nodes never received the event. Now I don't have to worry about it since the actual value is fetched from the context.

2. Fixes the export button to get bounds of only visible nodes.
3. Fixes Filter button to hide edges of hidden nodes.

Code Changes Checklist

• New or updated unit tests added
• All existing tests pass (npm run test)
• Code follows contributing guidelines
• Telemetry/logging updated if relevant
• No regressions or UX breakage

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[github-actions]

PR Changes

Category	Main Branch	PR Branch	Difference
Code Coverage	58.55%	58.24%	$${\color{lightgreen} -.31\% }$$
VSIX Size	15304 KB	15319 KB	$${\color{lightgreen} 15 KB \space (0\%) }$$
Webview Bundle Size	3688 KB	3692 KB	$${\color{lightgreen} 4 KB \space (0\%) }$$