Make NEW_CREATION_FLOW feature flag visible

[pavolum]

Prior to making the new creation flow visible we need to

• [x] Fix the query that populates the template list
• [x] Validate new '@microsoft' generator packages e2e in composer
• [x] Delist previous 'preview.' generators so they no longer show up in template selection UI
• [x] Add the empty bot template
• [x] Update conversational core template generator to grab Ryans latest updates
• [x] Update design of template picker per #5730
• [x] Update all templates to use latest runtime generator package that has the latest bits from Carlos and Peter

[benbrown]

5898 achieved the last few items here.

5903 actually makes the flag visible.