Make the 'Edit Rules' ignore notifications in Slack clearer

[teolemon]

What

• We set rules to ignores ingredient modifications under certain rules, and we send a notification to #edit-alerts
  they're not very legible right now.
• Show what has changed more clearly in the Slack notifications created by some edit rules

Code pointer

my $diff = String::Diff::diff_merge('this is Perl', 'this is Ruby');
print "$diff\n";# this is [Perl]{Ruby}
http://search.cpan.org/dist/String-Diff/lib/String/Diff.pm

Part of

• 🧽 Data quality (tracker) #5538

[hangy]

@teolemon The title "Make the ignore notifications clearer" does not match the task description. Was this supposed to be two different issues?

[teolemon]

We set rules to ignores ingredient modifications under certain rules, and we send a notification to #edit-alerts
they're not very legible right now.

[teolemon]

but at the same time, changing the format would make impossible to process the backlog.