fix: Fix StorageInstanceManager cache eviction

[janbuchar]

• See the added test to understand the problematic scenario.
• There is a good chance that this wouldn't cause any problems in practice, but better safe than sorry.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.34%. Comparing base (b80f562) to head (d49265a).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1855      +/-   ##
==========================================
- Coverage   92.41%   92.34%   -0.08%     
==========================================
  Files         158      158              
  Lines       11009    11009              
==========================================
- Hits        10174    10166       -8     
- Misses        835      843       +8     

Flag	Coverage Δ
unit	92.34% <100.00%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[vdusek]

LGTM