Add LogBuffer output to device logs screen

[mchowning]

Description

When I initially implemented the device logs screen in #911, I failed to append the LogBuffer logs to the output. This PR fixes that.

Before this fix, the logs would end with the "Episode Issues" and would contain none of the timestamped logs like "I 16/5 17:31:44 App started. 7.38 (9094)".

Note
I am targeting release/7.39 with this because it seems like a pretty safe change and it would be good to get this out quickly since it fixes a new feature. I don't think we need to do a hotfix for this because emailing the logs (either from the logs display screen or if the user tries to contact support) will still include the full logs, so there is a workaround. I don't think we need to worry about immediately cutting a new beta with this—it's not urgent imo.

Testing Instructions

1. Go to "Profile" → ⚙️ → "Help & feedback"
2. Tap on the logs icon at the top fo the screen
3. Verify that the screen includes the LogBuffer logs at the bottom.

Checklist

• If this is a user-facing change, I have added an entry in CHANGELOG.md
• I have considered whether it makes sense to add tests for my changes
• All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml

[ashiagr]

Verified, full logs are appended now. Thanks for fixing it!