chore: remove unused code

[vitorhugods]

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

Some of the code in UserSessionScope was completely unused.

Solutions

🧹🗑️♻️

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[github-actions]

Unit Test Results

0 files   -    458  0 suites   - 458   0s ⏱️ - 3m 14s
0 tests  - 2 550  0 ✔️  - 2 448  0 💤  - 102  0 ❌ ±0 

Results for commit 23ebed9. ± Comparison against base commit c679750.

♻️ This comment has been updated with latest results.

[datadog-wireapp]

Datadog Report

All test runs 349d848 🔗

✅ 2 Total Test Services: 0 Failed, 0 with New Flaky, 2 Passed

Test Services

Service Name	Failed	Known Flaky	New Flaky	Passed	Skipped	Wall Time	Branch View
kalium-ios	0	0	0	1769	30	10.1s	Link
kalium-jvm	0	0	0	2448	102	14m 40s	Link

[codecov-commenter]

Codecov Report

Merging #2149 (241354f) into develop (c82d8aa) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2149      +/-   ##
=============================================
- Coverage      57.82%   57.81%   -0.01%     
  Complexity        21       21              
=============================================
  Files           1058     1058              
  Lines          40142    40142              
  Branches        3719     3719              
=============================================
- Hits           23211    23209       -2     
- Misses         15325    15326       +1     
- Partials        1606     1607       +1     

see 2 files with indirect coverage changes

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