feat(self-hosted): Errors only self-hosted sidebar

[hubertdeng123]

Take 3 of #71948. The PR that originally introduced sidebar changes was reverted, causing frontend tests that were introduced here to fail.

[codecov]

Bundle Report

Changes will increase total bundle size by 134 bytes ⬆️

Bundle name	Size	Change
app-webpack-bundle-array-push	27.89MB	134 bytes ⬆️

[hubertdeng123]

@gggritso I've noticed you've recently been working on sidebar changes, and wanted to loop you in as I've improved some of the test coverage here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.91%. Comparing base (51ccc1d) to head (c785ff8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #72012   +/-   ##
=======================================
  Coverage   77.91%   77.91%           
=======================================
  Files        6573     6573           
  Lines      292701   292702    +1     
  Branches    50523    50523           
=======================================
+ Hits       228053   228059    +6     
+ Misses      58401    58396    -5     
  Partials     6247     6247           

Files	Coverage Δ
static/app/components/sidebar/index.tsx	80.71% <100.00%> (+1.57%)	⬆️

... and 2 files with indirect coverage changes

[sentry]

Suspect Issues

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

• ‼️ TypeError: Cannot read properties of undefined (reading 'pathname') Sidebar(index.tsx) View Issue
• ‼️ TypeError: Cannot read properties of undefined (reading 'pathname') Sidebar(index.tsx) View Issue
• ‼️ TypeError: Cannot read properties of undefined (reading 'pathname') Sidebar(index.tsx) View Issue
• ‼️ TypeError: Cannot read properties of undefined (reading 'pathname') Sidebar(index.tsx) View Issue

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