fix: show proper empty user search screens [WPB-6257] 🍒

[github-actions]

This PR was automatically cherry-picked based on the following PR:

• fix: show proper empty user search screens [WPB-6257] #3589

Original PR description:

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WPB-6257 [Android] Search hint for no result is not shown anymore

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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
  • contains a reference JIRA issue number like SQPIT-764
  • 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

When we search for a user and don’t receive a result, then the correct search hint is not shown anymore.

Solutions

Use empty user search screens properly - when not searching show initial contacts list or empty screen with "learn more" button, when searching show results or "no results found" screen.
Removed unused fields from states, added/fixed loading state and previews for all possibilities.

Testing

How to Test

Search for a user which does not exist, or which you can not find due to search configurations.

Attachments (Optional)

Before	After

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PR Post Submission Checklist for internal contributors (Optional)

• Wire's Github Workflow has automatically linked the PR to a JIRA issue

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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.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 45.29%. Comparing base (55863ae) to head (2f00375).

Files with missing lines	Patch %	Lines
...me/conversations/search/SearchServicesViewModel.kt	0.00%	5 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release/candidate    #3602      +/-   ##
=====================================================
+ Coverage              45.27%   45.29%   +0.01%     
=====================================================
  Files                    470      470              
  Lines                  15802    15800       -2     
  Branches                2655     2655              
=====================================================
+ Hits                    7155     7157       +2     
+ Misses                  7879     7875       -4     
  Partials                 768      768              

Files with missing lines	Coverage Δ
...i/home/conversations/search/SearchUserViewModel.kt	95.06% <100.00%> (+0.12%)	⬆️
...me/conversations/search/SearchServicesViewModel.kt	0.00% <0.00%> (ø)

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[sonarcloud]

Quality Gate passed

Issues
8 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

Built wire-android-staging-compat-pr-3602.apk is available for download