fix(playwrighttesting): branch name for ADO pipelines (Azure#32621)

### Packages impacted by this PR

@azure/microsoft-playwright-testing

### Issues associated with this PR


### Describe the problem that is addressed by this PR


### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?


### Are there test cases added in this PR? _(If not, why?)_


### Provide a list of related PRs _(if any)_


### Command used to generate this PR:**_(Applicable only to SDK release
request PRs)_

### Checklists
- [ ] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [ ] Added a changelog (if necessary)

Author: Sid200026

sdk/playwrighttesting/microsoft-playwright-testing/src/utils/cIInfoProvider.ts

@@ -59,7 +59,7 @@ export class CIInfoProvider {
       return {
         provider: CI_PROVIDERS.ADO,
         repo: process.env["BUILD_REPOSITORY_ID"] || null,
-        branch: process.env["BUILD_SOURCEBRANCH"] || null,
+        branch: process.env["BUILD_SOURCEBRANCHNAME"] || null,
         author: process.env["BUILD_REQUESTEDFOR"] || null,
         commitId: process.env["BUILD_SOURCEVERSION"] || null,
         revisionUrl: process.env["SYSTEM_TEAMFOUNDATIONCOLLECTIONURI"]

sdk/playwrighttesting/microsoft-playwright-testing/test/utils/clInfoProvider.spec.ts

@@ -61,7 +61,8 @@ describe("CIInfoProvider", () => {
     process.env["AZURE_HTTP_USER_AGENT"] = "someAgent";
     process.env["TF_BUILD"] = "true";
     process.env["BUILD_REPOSITORY_ID"] = "repo123";
-    process.env["BUILD_SOURCEBRANCH"] = "main";
+    process.env["BUILD_SOURCEBRANCH"] = "refs/head/main";
+    process.env["BUILD_SOURCEBRANCHNAME"] = "main";
     process.env["BUILD_REQUESTEDFOR"] = "testAuthor";
     process.env["BUILD_SOURCEVERSION"] = "commitSha123";
     process.env["SYSTEM_TEAMFOUNDATIONCOLLECTIONURI"] = "https://dev.azure.com/";