Make Docker command exec error output optional based on the pipeline feature (#445)

* Make Docker exec error logging optional based on the HideDockerExecTaskLogIssueErrorOutput feature flag.

Context: When the flag is enabled, Docker exec log output is processed as error logs rather than individual log issues, resulting in a cleaner build UI where these errors are not displayed.

* Move getPipelineFeature outside the loop to cache its value

* Update the docker-common package verison

Author: ivanduplenskikh

common-npm-packages/docker-common/containerconnection.ts

@@ -43,19 +43,29 @@ export default class ContainerConnection {
     public execCommand(command: tr.ToolRunner, options?: tr.IExecOptions) {
         let errlines = [];
         let dockerHostVar = tl.getVariable("DOCKER_HOST");
+
         if (dockerHostVar) {
             tl.debug(tl.loc('ConnectingToDockerHost', dockerHostVar));
         }
 
         command.on("errline", line => {
             errlines.push(line);
         });
-        return command.exec(options).fail(error => {            
+        
+        const hideDockerExecTaskLogIssueErrorOutput = tl.getPipelineFeature("hideDockerExecTaskLogIssueErrorOutput");
+
+        return command.exec(options).fail(error => {
             if (dockerHostVar) {
                 tl.warning(tl.loc('DockerHostVariableWarning', dockerHostVar));
             }
 
-            errlines.forEach(line => tl.error(line));
+            errlines.forEach(line => {
+                if (hideDockerExecTaskLogIssueErrorOutput) {
+                    console.log(`##[error]${line}`);
+                } else {
+                    tl.error(line);
+                }
+            });
             throw error;
         });
     }

common-npm-packages/docker-common/package-lock.json

@@ -1,6 +1,6 @@
 {
     "name": "azure-pipelines-tasks-docker-common",
-    "version": "2.254.0",
+    "version": "2.256.0",
     "description": "Common Library for Azure Rest Calls",
     "repository": {
         "type": "git",