Add Labels from MR to Argocd AppProject

[smileisak]

Description of your changes

This pull request introduces the capability for the argocd provider to support defining and adding labels to the ArgoCD AppProject from the MR. Labels in ArgoCD play a crucial role as they allow AppProjects to inherit default spec values from a global AppProject. Documentation link

Fixes #105

I have:

• [x] Read and followed Crossplane's contribution process.
• [x] Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

The code has been tested using a local setup where an ArgoCD project was created using the argocd provider. I verified:

• The labels are correctly added to the AppProject.
• There were no synchronization issues or delays.

[smileisak]

@MisterMX can you take a look on it. I have made the change as requested.