Add default priority for bug reports

[adchia]

What this PR does / why we need it:
This will make all bug reports have a priority/p2 tag by default. Priorities can be adjusted manually afterwards.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[felixwang9817]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adchia, felixwang9817

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[codecov-commenter]

Codecov Report

Merging #2207 (9517e01) into master (a16c5e4) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2207      +/-   ##
==========================================
- Coverage   84.46%   84.45%   -0.02%     
==========================================
  Files         104      104              
  Lines        8247     8247              
==========================================
- Hits         6966     6965       -1     
- Misses       1281     1282       +1     

Flag	Coverage Δ
integrationtests	74.20% <ø> (-0.30%)	⬇️
unittests	58.65% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../integration/online_store/test_universal_online.py	97.67% <0.00%> (-0.47%)	⬇️

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