fix(security): hide integrations code from members

[oioki]

This change hides code field from integration details for members. This is to prevent from misusing integration code by member-level users.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.84%. Comparing base (661d072) to head (23b0780).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #70128      +/-   ##
==========================================
- Coverage   79.84%   79.84%   -0.01%     
==========================================
  Files        6509     6509              
  Lines      289823   289823              
  Branches    49922    49922              
==========================================
- Hits       231419   231415       -4     
- Misses      57991    57995       +4     
  Partials      413      413              

Files	Coverage Δ
...s/integrations/sentry_apps/installation/details.py	100.00% <100.00%> (ø)
...nts/integrations/sentry_apps/installation/index.py	100.00% <ø> (ø)
.../api/serializers/models/sentry_app_installation.py	100.00% <100.00%> (ø)

... and 8 files with indirect coverage changes

[getsentry-bot]

PR reverted: 32a2416f61c6a01a9d5b1d2af25283f9a24f1096