V0.3: Category, ResourceQuota and ErrorMessages

This MR is not merging to master. If branch node-selector is already merged to master change target branch to master not sure if GitLab does it automatically.

Changelog:

• Operator started updating the field Status.status and Status.errorMessage on the CR;
• Site category is now being set on project creation. Site category is being considered an immutable field so consequent changes in the CR to this field after project creation will not propagate to the project;
• Resource quota label is being set and updated on project and ResourceQuota resource is being created and updated properly.