[iOS] Improved text view injection

[Velin92]

• A default text view is always provided, to allow for easier testing and avoid using an optional, even if you should always inject it from the UI wrapper
• The initialisation is done directly by a convenience init from the text view itself
• the MentionsDisplayHelper is now managed by the viewModel which will refresh it on the textView

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (2f40a21) 89.96% compared to head (41f0075) 88.23%.

Files	Patch %	Lines
...WysiwygComposerView/WysiwygComposerViewModel.swift	59.25%	10 Missing and 1 partial ⚠️
...ents/WysiwygComposerView/WysiwygComposerView.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #935      +/-   ##
==========================================
- Coverage   89.96%   88.23%   -1.74%     
==========================================
  Files          32      118      +86     
  Lines        1565    16935   +15370     
  Branches      623      616       -7     
==========================================
+ Hits         1408    14942   +13534     
- Misses        132     1964    +1832     
- Partials       25       29       +4     

Flag	Coverage Δ
uitests	?
uitests-ios	?
unittests	88.23% <67.50%> (+13.15%)	⬆️
unittests-ios	75.70% <67.50%> (+0.62%)	⬆️
unittests-rust	89.50% <ø> (?)

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