Slack notification message format

[data-han]

Is your feature request related to a problem? Please describe.
With the update from 0.18.2x, the format of the slack notification changed and it's not as clean as before. Also, there is this extra 'Validation Results' message which bothers me a lot. Is anyone else facing the same issue?

Issue 1: Exists in both version, i think in 0.17.x there wasn't this message. "Validation results .. <file......>" the long text in between --> can this be removed? anyone else facing this?

Issue 2: In the older version like 0.18.13 before the reformat, the message is cleaner where Expectation suite name: and Data asset name are indented and bolded nicely which is very easy to see. However, after the upgrade, the message is just plain text and it's hard to see what is what.

0.18.13 (old)

1.3.1 (new)

Describe the solution you'd like
A clean message on Slack.

Describe alternatives you've considered

Additional context

[data-han]

@NathanFarmer hi there! I noticed you have issued a PR to fix this duplicate link text last year but not sure why I am still seeing this error. Have you got a clue? Im already using the latest 1.3.2.

#9986

[data-han]

Also, I feel like it's a good idea to have the number of failed expectations / total. This gives us a gauge at one glance instead of having to click into it...