remove custom error (#85)

Co-authored-by: Dean Oren <deangili.oren@mail.schwarz>

stackit/internal/resources/data-services/instance/actions.go

@@ -194,17 +194,11 @@ func (r Resource) Update(ctx context.Context, req resource.UpdateRequest, resp *
 		return
 	}
 
-	planID := plan.PlanID
 	if err := r.applyClientResponse(ctx, &plan, newRes.JSON200); err != nil {
 		resp.Diagnostics.AddError("failed to process client response", err.Error())
 		return
 	}
 
-	if !plan.PlanID.Equal(planID) {
-		resp.Diagnostics.AddError("server returned wrong plan ID after update", fmt.Sprintf("expected plan ID %s but received %s", planID.ValueString(), plan.PlanID.ValueString()))
-		return
-	}
-
 	// update state
 	diags := resp.State.Set(ctx, &plan)
 	resp.Diagnostics.Append(diags...)