FEAT: whats new feed to user

[nishant-d]

show changes after upgrade or changes which we have released on dashboard

AB#10248

[uxarya-d]

UI

What's New modal (https://zpl.io/VkQWL0W) New version available banner on app list (https://zpl.io/b6GBp0g)

[rashmirai21]

• [x] UI (modal, nav)
• [ ] Explore Github API
• [ ] Integrate API

[azure-boards[bot]]

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• 10248

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