Add common template files for tools 1es migration

eng/pipelines/templates/stages/1es-redirect.yml

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+resources:
+  repositories:
+    - repository: 1ESPipelineTemplates
+      type: git
+      name: 1ESPipelineTemplates/1ESPipelineTemplates
+      ref: refs/tags/release
+    - repository: azure-sdk-build-tools
+      type: git
+      name: internal/azure-sdk-build-tools
+      ref: refs/tags/azure-sdk-build-tools_20230829.1
+
+parameters:
+- name: stages
+  type: stageList
+  default: []
+- name: Use1ESOfficial
+  type: boolean
+  default: true
+
+extends:
+  ${{ if and(parameters.Use1ESOfficial, eq(variables['System.TeamProject'], 'internal')) }}:
+    template: v1/1ES.Official.PipelineTemplate.yml@1ESPipelineTemplates
+  ${{ else }}:
+    template: v1/1ES.Unofficial.PipelineTemplate.yml@1ESPipelineTemplates
+  parameters:
+    settings:
+      skipBuildTagsForGitHubPullRequests: true
+    sdl:
+      sourceAnalysisPool:
+        name: azsdk-pool-mms-win-2022-general
+        image: azsdk-pool-mms-win-2022-1espt
+        os: windows
+      sourceRepositoriesToScan:
+        exclude:
+          - repository: azure-sdk-build-tools
+      psscriptanalyzer:
+        compiled: true
+        break: true
+
+  stages: ${{ parameters.stages }}

eng/pipelines/templates/variables/image.yml

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+# Default pool image selection. Set as variable so we can override at pipeline level
+
+variables:
+  - name: LINUXPOOL
+    value: azsdk-pool-mms-ubuntu-2004-general
+  - name: WINDOWSPOOL
+    value: azsdk-pool-mms-win-2022-general
+  - name: MACPOOL
+    value: Azure Pipelines
+
+  - name: LINUXVMIMAGE
+    value: azsdk-pool-mms-ubuntu-2004-1espt
+  - name: LINUXNEXTVMIMAGE
+    value: azsdk-pool-mms-ubuntu-2204-1espt
+  - name: WINDOWSVMIMAGE
+    value: azsdk-pool-mms-win-2022-1espt
+  - name: MACVMIMAGE
+    value: macos-11
+
+  # Values required for pool.os field in 1es pipeline templates
+  - name: LINUXOS
+    value: linux
+  - name: WINDOWSOS
+    value: windows
+  - name: MACOS
+    value: macOS
+