enforce maximum length on workspace_id

This helps applications to not make assumptions that are false. 64 characters is a common limit that is not too restrictive for users/use-cases. In most cases special characters are not allowed at the start of identifiers.

By having these constraints it is easier to map workspace_id's to other resources that might impose similar constraints.

extensions/workspaces/openapi.yaml

@@ -301,7 +301,7 @@ components:
   schemas:
     workspace_id:
       type: string
-      pattern: '^[\w\-\.~]+$'
+      pattern: '^[A-Za-z0-9][\w\-\.~]{0,62}$' 
       example: my-workspace
     workspace_title:
       type: string