Use full date format for day dividers in timeline

[jmartinesp]

Type of change

• Feature
• Bugfix
• Technical
• Other : improve UX

Content

• Adds a new dateWithFullFormatFormatter that will use the same format as iOS.
• Changes the onlyTimeFormatter so it also adds AM/PM for locales that use them.

Motivation and context

Fixes #2916.

Screenshots / GIFs

Before	After

Tests

• Check the new formats are used.

Tested devices

• Physical
• Emulator
• OS version(s): 14

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[github-actions]

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[sonarcloud]

Quality Gate passed

Issues
0 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

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.91%. Comparing base (4317b80) to head (8bb504e).

Files	Patch %	Lines
...dateformatter/impl/DefaultDaySeparatorFormatter.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3057   +/-   ##
========================================
  Coverage    75.91%   75.91%           
========================================
  Files         1628     1628           
  Lines        38409    38411    +2     
  Branches      7421     7420    -1     
========================================
+ Hits         29158    29160    +2     
  Misses        5375     5375           
  Partials      3876     3876           

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