[Session manager] Other sessions list: header should not be sticky (PSG-1115)

[mnaturel]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

In the other sessions list screen, making the header as collapsable so that it gives more place to the list.

Motivation and context

Closes #7797

Screenshots / GIFs

Tests

• Enable the labs setting for the new session manager
• Go to Settings -> Security & Privacy -> Show all sessions
• Press the View All button in the Other sessions section (need more than 5 other sessions)
• Check the scrolling behavior of the list and the header with the different filter options

Tested devices

• Physical
• Emulator
• OS version(s): Android 11

Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-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/vector-im/element-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
• If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

[fedrunov]

LGTM

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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