Timeline : remove the encrypted history banner

[ganfra]

Content

Remove the encrypted history banner for now as it needs more design and consideration.
This should come back with a proper implementation from the rust sdk.

Motivation and context

Closes #3391

Screenshots / GIFs

Tests

• Step 1
• Step 2
• Step ...

Tested devices

• Physical
• Emulator
• OS version(s):

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 title will be used in the release note, it clearly define what will change for the user
• 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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.62%. Comparing base (d611c1f) to head (b9a5819).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3410   +/-   ##
========================================
  Coverage    82.62%   82.62%           
========================================
  Files         1699     1697    -2     
  Lines        39963    39940   -23     
  Branches      4862     4860    -2     
========================================
- Hits         33019    33000   -19     
+ Misses        5229     5226    -3     
+ Partials      1715     1714    -1     

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[CLAassistant]

All committers have signed the CLA.

[bmarty]

LGTM, thanks!

[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