Update django logger and deploy script handling

[mbeacom]

Description

The goal of this PR is to disable the mail_admins log handler for all environments except prod and add granular control to other steps (crontab, etc) in the deploy.bash script.

Additionally, this allows us to disable the crontab update step (for staging) to avoid the mushrooming sync_geth.log.

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

deploy

Testing

Local and stage

[codecov]

Codecov Report

Merging #1437 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1437      +/-   ##
==========================================
- Coverage   30.26%   30.25%   -0.02%     
==========================================
  Files         125      125              
  Lines        9051     9054       +3     
  Branches     1161     1162       +1     
==========================================
  Hits         2739     2739              
- Misses       6203     6206       +3     
  Partials      109      109

Impacted Files	Coverage Δ
app/app/settings.py	81.76% <0%> (-1.38%)	⬇️

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[owocki]

didnt test but LGTM