Microsoft Teams plugin bugs

[reintroducing]

Describe the bug
There are a few bugs in the Teams plugin that we noticed upon our first publish. See the screenshot of the output in the Screenshots section.

The bugs:

• The @channel portion is not being converted to the channel name correctly to actually notify the channel.
• All of the links are broken (looks like they aren't being parsed correctly and the portion after the | pipe is being added to the link instead of being the visual for the link with the preceding portion being the actual link.
• Generally speaking, the formatting is not visually appealing like the Slack plugin.

To Reproduce
Use the Teams plugin :)

Expected behavior
Better formatting and link parsing, @channel reflects the actual channel.

Screenshots

Environment information:

Environment Information:

"auto" version: v10.25.1
"git"  version: v2.29.2
"node" version: v12.13.0

Additional context

[vincentbriglia]

related to #1914

[reintroducing]

Closed by #1914