added warning message to cli v5 tasks (#340)

Author: benPearce1

source/tasks/OctoCli/OctoCliV5/octoCli.ts

@@ -1,12 +1,14 @@
 import { OctoServerConnectionDetails } from "../../Utils/connection";
 import { executeTask } from "../../Utils/octopusTasks";
 import { OctopusToolRunner } from "../../Utils/tool";
+import * as tasks from "azure-pipelines-task-lib";
 
 export class OctoCli {
     constructor(readonly tool: OctopusToolRunner, readonly command: string, readonly connection: OctoServerConnectionDetails) {}
 
     public async run(args: string | undefined) {
         this.tool.arg(this.command);
+        tasks.warning("This task is using a deprecated version of the Octopus CLI, we recommend using the latest version.");
         await executeTask(this.tool, "(cli;run;v5)", this.connection, "Succeeded executing octo command.", "Failed to execute octo command.", args);
     }
 }

source/tasks/OctoInstaller/OctoInstallerV5/installer.ts

@@ -15,6 +15,7 @@ export class Installer {
     public async run(versionSpec: string) {
         await executeWithSetResult(
             async () => {
+                tasks.warning("This task is using a deprecated version of the Octopus CLI, we recommend using the latest version.");
                 const endpoint = await new DownloadEndpointRetriever(this.octopurlsUrl).getEndpoint(versionSpec);
                 let toolPath = tools.findLocalTool(TOOL_NAME, endpoint.version);