Add flow to create a new site from remote site

[sejas]

Related issues

• Fixes STU-856

Proposed Changes

• Add a new flow to create a new site and start pulling immediately.

Testing Instructions

• Enable the flag streamlineOnboarding from the UI or from CLI env.
• Click on Add site
• Notice that there is a new button to Create a new site from remote.
• Select a remote site and continue with the process
• Observe that the site is created and starts pulling immediately

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[github-actions]

📊 Performance Test Results

Comparing eeca41b vs trunk

site-editor

Metric	trunk	eeca41b	Diff	Change
load	14434.00 ms	10405.00 ms	-4029.00 ms	🟢 -27.9%

site-startup

Metric	trunk	eeca41b	Diff	Change
siteCreation	19251.00 ms	18189.00 ms	-1062.00 ms	🟢 -5.5%
siteStartup	7055.00 ms	5988.00 ms	-1067.00 ms	🟢 -15.1%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change