By default, all users are allowed to consent to applications for permissions that don't require administrator consent. For example, by default, a user can consent to allow an app to access their mailbox but can't consent to allow an app unfettered access to read and write to all files in your organization.
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/manage-apps/configure-user-consent

When Add-ins get embedded into documents using side loaded Add-ins, it is important to know that the Add-ins get embedded with the path of the shared drive. If other users are using a different path for the side loaded Add-in, the Add-in will not appear for them as the path is not identical to the one used to embedded the Add-in.
Reference:
https://help.officeatwork.com/en/articles/299-deploying-office-add-ins-via-sideloading

This solution does not meet the goal because creating a Microsoft Teams app from the Developer Portal and adding a personal tab with the name, ID, and content URL of the website is not enough to deploy the app. You also need to create an app package, build and run your application, and upload your app in Teams12.
A possible solution that meets the goal is:
From the command prompt, install Microsoft Teams app generator by entering: npm install generator-teams --global Generate your application with a personal tab using: yo teams Add a content page to the personal tab Create your app package using: gulp manifest Build and run your application using: gulp serve Upload your app in Teams by sideloading it for personal use2

This solution does not meet the goal because creating a bot that monitors the build pipeline and pushes the messages to the channel by using the Microsoft Bot Framework requires additional coding and configuration.
A simpler and more efficient solution is to use Azure Pipelines app for Microsoft Teams1. This app allows you to easily subscribe to build status messages from Azure DevOps and receive them in your Teams channel without writing any code.
Alternatively, you can also use Incoming Webhook2 or Project or Roadmap app3 to send notifications to a Teams channel from other sources.
In addition, there are some recent news about Microsoft Teams that you might be interested in:
Microsoft Teams Allows Users To Mark Messages As Important Or Urgent4
Microsoft Teams is getting big performance improvements next month5