Prevent contributor dangerous mistake : a pipe without anything after or before

**Problem**
On bubble 1859, there was this regex line : `(nest.audio|nest.mini|home.mini|nest.hub|lenovo.smart.clock|lenovo.smart.display|homepod|) `

Contributor forgot one pipe at the end of his regex.
Consequence : It matched with all page of website listed in domain list.

Many users have bee annoyed during their navigation, stats were thus awful :

Fortunaltly, during Q&A work, Julien saw the problem and alerted the team.
The false positive so named lasted 2 days.


**Solutions**
1. In contribution BO, if a contributor writes `|)` or `(|` the system blocks him.
2. If a contribution has in an hour more than 10 views and a rate detail click / view < 3% during this hour, it alerts contribution@dismoi.io with the number of the bubble. (This solution needs to be discussed with contribution team and technical team to be refined)