[Device Manager] Extend user agent to include device information (PSG-755)

[onurays]

Type of change

• [x] Feature
• [ ] Bugfix
• [ ] Technical
• [ ] Other :

Content

User agent string improved by adding device information like: Element dbg/1.5.0-dev (Xiaomi Mi 9T; Android 11; RKQ1.200826.002 test-keys; Flavour GooglePlay; MatrixAndroidSdk2 1.5.0)

Motivation and context

Screenshots / GIFs

Tests

Tested devices

• [ ] Physical
• [ ] Emulator
• OS version(s):

Checklist

• [x] 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
• [x] Pull request is based on the develop branch
• [x] 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
• [x] 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()

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

95.6% Coverage
0.0% Duplication