Add ability to force running rollback or not after cancelling (#615)

**What this PR does / why we need it**:

**Which issue(s) this PR fixes**:

Fixes #

**Does this PR introduce a user-facing change?**:
<!--
If no, just write "NONE" in the release-note block below.
-->
```release-note
NONE
```


This PR was merged by Kapetanios.

pkg/app/api/api/web_api.go

@@ -675,8 +675,9 @@ func (a *WebAPI) CancelDeployment(ctx context.Context, req *webservice.CancelDep
 		Type:          model.Command_CANCEL_DEPLOYMENT,
 		Commander:     claims.Subject,
 		CancelDeployment: &model.Command_CancelDeployment{
-			DeploymentId:    req.DeploymentId,
-			WithoutRollback: req.WithoutRollback,
+			DeploymentId: req.DeploymentId,
+			//ForceRollback:   req.ForceRollback,
+			//ForceNoRollback: req.ForceNoRollback,
 		},
 	}
 	if err := a.addCommand(ctx, &cmd); err != nil {

pkg/app/api/service/webservice/service.proto

@@ -245,6 +245,8 @@ message GetStageLogResponse {
 
 message CancelDeploymentRequest {
     string deployment_id = 1 [(validate.rules).string.min_len = 1];
+    //bool force_rollback = 2;
+    //bool force_no_rollback = 3;
     bool without_rollback = 2;
 }
 

pkg/model/command.proto

@@ -46,7 +46,8 @@ message Command {
 
     message CancelDeployment {
         string deployment_id = 1 [(validate.rules).string.min_len = 1];
-        bool without_rollback = 2;
+        bool force_rollback = 2;
+        bool force_no_rollback = 3;
     }
 
     message ApproveStage {