[PER-10311] Implement unlisted share page UI for users without an account

[aasandei-vsp]

https://permanent.atlassian.net/browse/PER-10311

!!!! This branch is actually based on PR: #727 so DO NOT MERGE.
I made it into a draft, especially because it would be hard to review the changes specific to this PR.

It is worth mentioning that this PR is way smaller than I anticipated. The reason for it is that when I separated the stories into logged in and anonymous users, I made the assumption that for logged in users I will not need to use the new stela endpoints to retrieve the details for the preview, which proved to be wrong.

[codecov]

Codecov Report

❌ Patch coverage is 48.21429% with 58 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.61%. Comparing base (1e8adef) to head (e450fcc).

Files with missing lines	Patch %	Lines
src/app/shared/services/api/folder.repo.ts	10.00%	27 Missing ⚠️
...er/components/file-viewer/file-viewer.component.ts	52.63%	7 Missing and 2 partials ⚠️
...ponents/file-list-item/file-list-item.component.ts	42.85%	8 Missing ⚠️
src/app/shared/services/api/record.repo.ts	46.15%	7 Missing ⚠️
...rowser/components/file-list/file-list.component.ts	20.00%	4 Missing ⚠️
...omponents/share-preview/share-preview.component.ts	66.66%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #741      +/-   ##
==========================================
+ Coverage   45.18%   46.61%   +1.43%     
==========================================
  Files         370      371       +1     
  Lines       11284    11369      +85     
  Branches     1860     1879      +19     
==========================================
+ Hits         5099     5300     +201     
+ Misses       6013     5881     -132     
- Partials      172      188      +16     

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