don't hard-crash on owner lookup failure

[drmorr0]

Related Links

• https://linear.app/acrl/issue/SK-63/export-is-broken-on-permissions
• https://linear.app/acrl/issue/SK-62/longunreadable-message

What

• Export now works even if the owned objects are inaccessible
• The logging messages are readable

Why

Bugfixes

Test Steps

What are all the steps to testing your code changes?

• Manual testing

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• I certify that this PR does not contain any code that has been generated with GitHub Copilot or any other AI-based code generation tool, in accordance with this project's policies.

[codecov]

Codecov Report

❌ Patch coverage is 26.31579% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.14%. Comparing base (2f7e448) to head (e9da31b).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
sk-store/src/manager.rs	0.00%	10 Missing ⚠️
sk-store/src/store.rs	55.55%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
- Coverage   75.34%   75.14%   -0.21%     
==========================================
  Files          58       58              
  Lines        3253     3263      +10     
  Branches      160      161       +1     
==========================================
+ Hits         2451     2452       +1     
- Misses        698      706       +8     
- Partials      104      105       +1     

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