feat: Automatic deployment for gitlab

[haouarihk]

What is this PR about?

This PR enables automatic deployments for GitLab-based Application and Compose services by registering Dokploy’s deploy webhook when a GitLab source is saved. It also adds a GitLab provider setting to enable or disable this automatic webhook setup, while keeping it enabled by default.

Reason For adding a toggle

Saving a GitLab source can now fail if Dokploy cannot create/update the GitLab webhook. For example, expired/invalid token, missing api scope, insufficient GitLab permissions, network failure, or GitLab API incompatibility.

Checklist

Before submitting this PR, please make sure that:

• You created a dedicated branch based on the canary branch.
• You have read the suggestions in the CONTRIBUTING.md file https://github.com/Dokploy/dokploy/blob/canary/CONTRIBUTING.md#pull-request
• You have tested this PR in your local instance. If you have not tested it yet, please do so before submitting. This helps avoid wasting maintainers' time reviewing code that has not been verified by you.

i've also tested watch paths, and it works great.

[haouarihk]

Notes that apps that are already setup, needs to be redeployed for this to work

[haouarihk]

I'm thinking of adding Trigger type. but maybe in another pull request.
the gilab api can create hooks for different trigger types.