Handle Spurious Updates

[tomrittervg]

• Add a new job outcome spurious update
• Initially create jobs with bug_id=0
• Move filing a bug until after vendoring
• Detect the spurious update return code
• If it's a spurious update, close out the job without filing a bug
• Otherwise file the bug and continue on like normal

Will resolve #215 once https://bugzilla.mozilla.org/show_bug.cgi?id=1761335 lands.

[codecov-commenter]

Codecov Report

Merging #233 (08391d6) into master (017ee81) will decrease coverage by 0.16%. The diff coverage is 61.53%.

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
- Coverage   87.65%   87.48%   -0.17%     
==========================================
  Files          39       39              
  Lines        4479     4499      +20     
==========================================
+ Hits         3926     3936      +10     
- Misses        553      563      +10     

Impacted Files	Coverage Δ
components/db.py	54.84% <50.00%> (-0.33%)	:arrow_down:
components/mach_vendor.py	71.73% <50.00%> (-2.68%)	:arrow_down:
tasktypes/vendoring.py	83.18% <62.50%> (-0.68%)	:arrow_down:
components/dbc.py	50.51% <100.00%> (+1.04%)	:arrow_up:
components/dbmodels.py	98.63% <100.00%> (+0.01%)	:arrow_up:

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