Converts GitHub integration authentication to use gk.dev GLVSC-554

[sergeibbb]

Description

Introduces a provider for GitHub integration that tries to check for existing GitHub session before accessing an integration on GKDev (GLVSC-554)

Checklist

• [x] I have followed the guidelines in the Contributing document
• [x] My changes follow the coding style of this project
• [x] My changes build without any errors or warnings
• [x] My changes have been formatted and linted
• [x] My changes include any required corresponding changes to the documentation (including CHANGELOG.md and README.md)
• [ ] My changes have been rebased and squashed to the minimal number (typically 1) of relevant commits
• [ ] My changes have a descriptive commit message with a short title, including a Fixes $XXX - or Closes #XXX - prefix to auto-close the issue that your PR addresses

[axosoft-ramint]

Hey @sergeibbb, while reviewing your PR, I'd suggest the following code changes:

👉 Fixes integration.connect throwing error for GitHub

Ensures that manageCloudIntegrations is always called before attempting integration.connect for GitHub

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[axosoft-ramint]

@sergeibbb There are issues with integration.connect being called on a cloud integration before it is ready. manageCloudIntegrations should always be called before attempting the connection, or the user may not be logged in or may not see the settings page first.

I made some updates to address this - see my code suggestion above.