chore(sentryapps): better logging and errors for select requester

[Christinarlong]

Ok more like let's differentiate between when we fail due to external requests failing or due to validation errors

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ps/api/endpoints/installation_external_requests.py	77.77%	1 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #79377       +/-   ##
===========================================
+ Coverage   57.01%   78.35%   +21.33%     
===========================================
  Files        7114     7125       +11     
  Lines      314446   315158      +712     
  Branches    51416    51510       +94     
===========================================
+ Hits       179292   246950    +67658     
+ Misses     130529    61739    -68790     
- Partials     4625     6469     +1844     

[sentry[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ValidationError: Invalid response format for SelectField in id=39357 scope_list=['event:read'] application_id=6569... sentry.api.sentry_app_components.get View Issue
• ‼️ UnboundLocalError: cannot access local variable 'url' where it is not associated with a value sentry.api.sentry_app_components.get View Issue
• ‼️ ValidationError: Invalid response format for SelectField in id=81605 scope_list=['event:read', 'event:write', 'org... sentry.api.sentry_app_components.get View Issue

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