feat: Migration of Gallery to Single Project

[vatsashah45]

GitHub Issue (If applicable): closes #

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting)
• Refactoring (no functional changes, no api changes)
• Build or CI related changes
• Documentation content changes
• Project automation
• Other... Please describe:

What is the current behavior?

What is the new behavior?

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] Tested on iOS.
• [ ] Tested on Wasm.
• [ ] Tested on Android.
• [ ] Tested on UWP.
• [ ] Tested in both Light and Dark themes.
• [ ] Associated with an issue (GitHub or internal)

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Internal Issue (If applicable):

[github-actions[bot]]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://white-field-08c5cf00f-1104.eastus2.3.azurestaticapps.net

[Youssef1313]

Building on top of this in https://github.com/unoplatform/Uno.Gallery/pull/1139 after resolving conflicts, adjusting for CI, adjust for few missing things, etc

[Youssef1313]

This is done now