Moved the 1ESPT yaml template to Azure-Pipeline folder (#2536)

#### Details

Moved the 1ESPT  yaml template to Azure-Pipeline folder.
##### Motivation

should keep all the Pipeline related files in the Azure-Pipeline folder

---------

Co-authored-by: Jitendra Jain <v-jitendjain@microsoft.com>

azure-pipeline/Accessibility_Insights_Service_CI_1ESPT.yml

@@ -0,0 +1,29 @@
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+name: $(Build.SourceBranchName)_$(Date:yyyyMMdd)$(Rev:.r)
+trigger: none
+
+# The `resources` specify the location and version of the 1ES PT.
+resources:
+    repositories:
+        - repository: 1esPipelines
+          type: git
+          name: 1ESPipelineTemplates/1ESPipelineTemplates
+          ref: refs/tags/release
+
+extends:
+    template: v1/1ES.Unofficial.PipelineTemplate.yml@1esPipelines
+    parameters:
+        # Update the pool with your team's 1ES hosted pool.
+        pool:
+            os: linux
+            image: ubuntu-20.04
+            name: AccessibilityInsights-ubuntu-20.04
+
+        stages:
+            - stage: Stage
+              jobs:
+                  - job: 'BuildArtifactsAndRunUnitTests'
+                    steps:
+                        - template: ./azure-pipeline/build-artifacts-and-run-tests-job.yaml