[MS-1240] Explicitly stopping camera on External Credential QR screen on pause

[alexandr-simprints]

JIRA ticket
Will be released in: 2025.4.0

Root cause analysis (for bugfixes only)

First known affected version: 2025.4.0
QR code analyzer stopped picking up images once the user returns to SID from another app. I wasn't able to reproduce the issue on any device, I'd be glad if @meladRaouf could test this solution before merging.

Notable changes

• CameraHelper can now be explicitly unbind
• External Credential QR scanner screen unbinds the camera in onPause, and re-initializes it in onResume

Testing guidance

• Open External Credential QR scanner screen
• Leave the app
• Return to the app
• Make sure different QR codes are being automatically picked up once pointed at

Additional work checklist

• Effect on other features and security has been considered
• Design document marked as "In development" (if applicable)
• External (Gitbook) and internal (Confluence) Documentation is up to date (or ticket created)
• Test cases in Testiny are up to date (or ticket created)

[sonarqubecloud]

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 SonarQube Cloud

[alexandr-simprints]

@meladRaouf has confirmed that these changes fix the QR code scanner issue