feat: Upgrades to net7.0

[fperreaultnv]

Proposed Changes

Upgrading the backend template to NET7.0

• Feature

What is the current behavior?

Targeting net6.0

What is the new behavior?

Targeting net7.0

Checklist

Please check if your PR fulfills the following requirements:

• [x] Documentation has been added/updated
• [x] Automated Unit / Integration tests for the changes have been added/updated
• [x] Contains NO breaking changes
• [x] Updated the Changelog
• [x] Associated with an issue

[DamienLaffond]

Backend Web & function localy test with .net 7 .