[Feature]: Enable GitHub personal access token for the bot

[openhands-agent]

What problem or use case are you trying to solve?
The bot currently utilizes personal access tokens to submit issues. There is a need to switch to the GitHub token for the repository "openhands-agent" to ensure proper access and functionality.

Describe the UX of the solution you'd like
Once the GitHub personal access token is established, the bot should automatically authenticate with the repository and post issues without any manual intervention.

Do you have thoughts on the technical implementation?
Implementing a configuration that allows the bot to securely store and use the new GitHub personal access token specifically for the "openhands-agent" repository.

Describe alternatives you've considered
Continuing to use personal access tokens which may not comply with best practices for repository access.

Additional context
This feature will significantly enhance the bot’s functionality and streamline issue posting directly from Slack.

[openhands-agent]

OpenHands started fixing the issue! You can monitor the progress here.

[openhands-agent]

An attempt was made to automatically fix this issue, but it was unsuccessful. A branch named 'openhands-fix-issue-46' has been created with the attempted changes. You can view the branch here. Manual intervention may be required.