timeline : remove animateItem

[ganfra]

Content

Remove the animate item modifier on timeline.

Motivation and context

Animation is weird most of the time.

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[bot]]

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[sonarcloud[bot]]

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.68%. Comparing base (c5f5ff3) to head (5a8cfda). Report is 16 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #3548 +/- ## =========================================== - Coverage 82.68% 82.68% -0.01% =========================================== Files 1732 1732 Lines 40983 40982 -1 Branches 4966 4966 =========================================== - Hits 33887 33886 -1 Misses 5340 5340 Partials 1756 1756 ```

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