Move session storage mode to the runtime.Config instead of an org config value

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #553 (65e6885) into main (0ffc72e) will increase coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #553      +/-   ##
==========================================
+ Coverage   58.80%   58.82%   +0.02%     
==========================================
  Files         134      134              
  Lines        9107     9106       -1     
==========================================
+ Hits         5355     5357       +2     
+ Misses       2936     2933       -3     
  Partials      816      816              

Impacted Files	Coverage Δ
core/models/orgs.go	52.50% <ø> (+0.64%)	⬆️
core/models/runs.go	3.82% <0.00%> (+0.01%)	⬆️
runtime/config.go	96.66% <100.00%> (+0.11%)	⬆️

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