[AND-254] Fix polls not respecting [disabled] from dashboard.

[VelikovPetar]

🎯 Goal

We are currently showing the "Poll" attachment option even if it is disabled from the dashboard. If a user attempts to send a poll in this state, it will result in an error.
This PR includes a check for channel.config.polls == true before the "Polls" attachment is added to the "AttachmentPicker"

🛠 Implementation details

• Compose: Introduce validation of the requested tabFactories in the AttachmentsPicker against the channel capabilities, to ensure that no disallowed factories are shown.
• XML: A bit different implementation, as we don't have direct access to the Channel in the attachments picker: Expose pollsEnabled in the MessageComposerState and add it to the arePollsEnabled check in the MessageComposerView

🎨 UI Changes

Before	After
before.mp4	after.mp4

🧪 Testing

Polls disabled

1. Disable polls in Dashboard
2. Open a channel
3. Open attachments picker
4. The "Poll" option should not be visible

Polls enabled

1. Enable polls in Dashboard
2. Open a channel
3. Open attachments picker
4. The "Poll" option should be visible

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-chat-android-client	3.17 MB	3.17 MB	0.00 MB	🟢
stream-chat-android-offline	3.38 MB	3.38 MB	0.00 MB	🟢
stream-chat-android-ui-components	7.86 MB	7.86 MB	0.00 MB	🟢
stream-chat-android-compose	8.73 MB	8.73 MB	0.00 MB	🟢

[sonarqubecloud]

Quality Gate failed

Failed conditions
78.2% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud