[Hyperion] Support for Install External helm application from devtron UI

[manish-agrawal-ai]

Description

Add support to install external helm application from devtron UI in Hyperion mode. The following features would get enabled for Hyperion mode :

1. Chart-repository
2. Chart-store (i.e. app-store)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[manish-agrawal-ai]

Testcases :
https://docs.google.com/spreadsheets/d/11GGSSl2B-_8Ns4RONRL2UHTTUz5JKjBBgFYMmyKDXhI/edit#gid=0