Sweep: Replace GitHub Issue Creation Webhook with GitLab Issue Webhook

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Description

This pull request encompasses changes necessary to transition from handling GitHub webhooks for issue creation to handling GitLab webhooks. It modifies the API endpoint to accept GitLab webhooks, updates the issue and pull request handling logic to work with GitLab's API, and introduces utility functions for interacting with GitLab.

Summary

• Replaced handle_github_webhook with handle_gitlab_webhook in sweepai/api.py to process incoming GitLab webhook events.
• Renamed the webhook endpoint from webhook to gitlab_webhook and updated the expected header from X-GitHub-Event to X-GitLab-Event.
• Transitioned from using the GitHub API to the GitLab API in sweepai/handlers/on_ticket.py. This includes fetching and updating issues, adding assignees, and handling merge requests.
• Introduced sweepai/utils/gitlab_utils.py containing utility functions such as get_gitlab_client for authenticating with the GitLab API, and functions for issue and comment management.
• Removed GitHub-specific utilities and replaced them with their GitLab equivalents across the codebase, ensuring compatibility with GitLab's project and issue models.

Fixes #77.

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Rollback Files For Sweep

• Rollback changes to sweepai/handlers/on_ticket.py
• Rollback changes to sweepai/api.py
• Rollback changes to sweepai/utils/gitlab_utils.py

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[bartbot]

Rerun this and resolve merge conflicts against main branch