[BUG]: Change email fix

[androolloyd]

Description

A 500 error occurs during email change, updated to use the update_or_create functionality of the Django orm to simplify the process.

Refers/Fixes

#6561

[codecov]

Codecov Report

Merging #6761 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6761      +/-   ##
==========================================
- Coverage   26.25%   26.23%   -0.02%     
==========================================
  Files         300      300              
  Lines       29329    29323       -6     
  Branches     4319     4317       -2     
==========================================
- Hits         7700     7693       -7     
+ Misses      21358    21355       -3     
- Partials      271      275       +4     

Impacted Files	Coverage Δ
app/marketing/utils.py	26.11% <100.00%> (-2.93%)	⬇️
app/quests/views.py	16.22% <0.00%> (ø)
app/dashboard/views.py	10.56% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
...eting/management/commands/assemble_leaderboards.py	39.73% <0.00%> (ø)

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[danlipert]

@androolloyd you were unable to replicate the bug, correct? What convinces you that this is the correct fix?

[androolloyd]

the issue was from a 500 error during the change, it happens when updating to an email in the master branch, you already used in the email marketing table, and lead me to the lines i changed.

Once moving to an update or create, the error stops, and from what i can tell everything is operating as expected, i am able to change between any email associated to me.

[androolloyd]

@androolloyd you were unable to replicate the bug, correct? What convinces you that this is the correct fix?

I was able to reproduce a 500 error and that error prevented me from updating my email address, there was a comment on a slack thread about a user getting a 500, once i saw that i investigated further as I had solved a 500 issue just moments before.