Long messages should be truncated in toast notifications

[Liz Blanchard]

Description
===========
Certain actions might trigger toast notifications that can have quite a lot of text. Today, we show all of the text and have a very large toast notification. Users have commented that this is overwhelming to see.

Expected result
===============
We should truncate this message so that it isn't as overwhelming. A link can be including in the case where the user would like to view more details.

[Liz Blanchard (lblanchard)]

Here is what the long message looks like today.

[Emilien Macchi (emilienm)]

This is an automated cleanup. This bug report has been closed because it
is older than 18 months and there is no open code change to fix this.
After this time it is unlikely that the circumstances which lead to
the observed issue can be reproduced.

If you can reproduce the bug, please:
* reopen the bug report (set to status "New")
* AND add the detailed steps to reproduce the issue (if applicable)
* AND leave a comment "CONFIRMED FOR: <RELEASE_NAME>"
  Only still supported release names are valid (FUTURE, PIKE, QUEENS, ROCKY, STEIN).
  Valid example: CONFIRMED FOR: FUTURE