allow and check for regex in email suppression

[danlipert]

Description

This change allows regexes to be used in the email suppression list, as well as checks for these regexes when syncing emails to and from mailchimp and our database.

Refers/Fixes

none

Testing

Tested locally

[danlipert]

@owocki here's a fix that allows us to use the current suppression list, but also use regexes if we need to

[codecov]

Codecov Report

Merging #4936 into master will decrease coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #4936      +/-   ##
==========================================
- Coverage   30.63%   30.63%   -0.01%     
==========================================
  Files         216      216              
  Lines       17491    17495       +4     
  Branches     2386     2388       +2     
==========================================
+ Hits         5359     5360       +1     
- Misses      11917    11919       +2     
- Partials      215      216       +1

Impacted Files	Coverage Δ
app/marketing/models.py	61.27% <100%> (ø)	⬆️
app/marketing/utils.py	32.45% <40%> (-0.21%)	⬇️

---

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[codecov]

Codecov Report

Merging #4936 into master will decrease coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #4936      +/-   ##
==========================================
- Coverage   30.63%   30.63%   -0.01%     
==========================================
  Files         216      216              
  Lines       17491    17495       +4     
  Branches     2386     2388       +2     
==========================================
+ Hits         5359     5360       +1     
- Misses      11917    11918       +1     
- Partials      215      217       +2

Impacted Files	Coverage Δ
app/marketing/models.py	61.27% <100%> (ø)	⬆️
app/marketing/utils.py	32.45% <40%> (-0.21%)	⬇️
app/dashboard/views.py	14.19% <0%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1058a00...e4c4239. Read the comment docs.