Add pseudo contributor role w/o readonly reqs, but write access

[illusional]

Short term hack for: #703

1. Check readonly
2. Then update the connection to make it non-readonly.

Though this gently points out that someone could update the connection.readonly attribute to False anywhere in the code, maybe this should be frozen.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 36.36364% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 77.08%. Comparing base (60d67d1) to head (c43a157).

Files	Patch %	Lines
api/utils/db.py	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #777      +/-   ##
==========================================
- Coverage   77.12%   77.08%   -0.04%     
==========================================
  Files         157      157              
  Lines       12957    12967      +10     
==========================================
+ Hits         9993     9996       +3     
- Misses       2964     2971       +7     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[dancoates]

Looks good, just a weird unrelated lint error that needs fixing by the looks of it

[jmarshall]

Weird that the linter didn't complain about has_participant_join in the PR in which it was recently added, but 🤷 …