[DECO-82] Kill sync process on reload (#114)

Fixes #107 
Fixes [DECO-82](https://databricks.atlassian.net/browse/DECO-82)

## Before change

https://user-images.githubusercontent.com/88345179/191867729-eb3a2101-e052-4b56-8cc5-46fdb21660db.mov

## After change

https://user-images.githubusercontent.com/88345179/191867512-4e57ec4e-ca3e-48e1-bd4a-797cc86f38b8.mov

Author: kartikgupta-db

packages/databricks-vscode/src/cli/BricksTasks.ts

@@ -54,6 +54,17 @@ export class SyncTask extends Task {
         this.group = TaskGroup.Build;
         this.presentationOptions.reveal = TaskRevealKind.Silent;
     }
+
+    static killAll() {
+        let found: boolean = false;
+        window.terminals.forEach((terminal) => {
+            if (terminal.name === "sync") {
+                found = true;
+                terminal.dispose();
+            }
+        });
+        return found;
+    }
 }
 
 /**
@@ -63,6 +74,8 @@ export class SyncTask extends Task {
  */
 class LazySyncProcessExecution extends ProcessExecution {
     private command?: Command;
+    private killThis: Boolean = false;
+
     constructor(
         private connection: ConnectionManager,
         private cli: CliWrapper,
@@ -117,6 +130,16 @@ class LazySyncProcessExecution extends ProcessExecution {
     }
 
     getSyncCommand(): Command {
+        if (
+            this.connection.state !== "CONNECTED" &&
+            (SyncTask.killAll() || this.killThis)
+        ) {
+            this.killThis = true;
+            return {
+                args: [],
+                command: "",
+            };
+        }
         if (this.command) {
             return this.command;
         }