Attach to GitHub Issue shows issues not in connected account

[arush-vashishtha]

In the GitHub plugin, when using the message action Attach to GitHub Issue, the dropdown shows issues that are not part of the connected GitHub account/repo.

Steps to reproduce:

• Connect GitHub account with Mattermost using the plugin.
• Open a channel, click on a message, select More Actions, then choose Attach to GitHub Issue.
• Open the issue dropdown.
• Notice that the list shows issues from repositories that are not linked to the connected account.

Expected Result:
Only issues from the connected GitHub account/repo should appear in the dropdown.

Actual Result:
The dropdown in Attach to GitHub Issue shows issues that are not from the connected account.

[Yash-Chakerverti]

@arush-vashishtha this is because it open searches for the issues