Merged PR 780713: Unreference secret variable groups

These pipelines no longer need this variable group

.azdo/1espt-integration/linux/job.yml

@@ -7,8 +7,6 @@ parameters:
 
 jobs:
 - job: Validation_1ESPT_${{ parameters.validationName }}
-  variables:
-  - group: "BuildXL Secrets"
   displayName: 1ESPipelines BuildXL workflow [Linux] (${{ parameters.validationName }})
   pool:
     name: BuildXL-DevOpsAgents-Linux-Stateless-PME

.azdo/common/set-variable-pats.yml

@@ -1,5 +1,4 @@
 # Sets pipeline variables with appropriate PATs to use as environment variables in internal selfhost builds 
-# Note this task assumes the variable group "BuildXL Secrets" is available
 parameters:
 - name: workingDirectory
   type: string

.azdo/debug/npm-experimental-bits.yml

@@ -26,8 +26,6 @@ resources:
 
 jobs:
 - job: Build_Linux
-  variables:
-  - group: "BuildXL Secrets"
   displayName: Build linux NPM package (${{ parameters.Flavor }})
   pool:
     name: BuildXL-DevOpsAgents-Linux-Stateless-PME

.azdo/distributed/selfhost-clean.yml

@@ -10,7 +10,6 @@ parameters:
 
 variables:
   - group: "BuildXL Common variables"
-  - group: "BuildXL Secrets"
   - name: Domino.DogfoodPackagePath
     value: $(Build.StagingDirectory)\$(Build.BuildId)\Dogfood
   - name: BuildXL.RepoDirectory

.azdo/pr/external_pr.yml

@@ -1,7 +1,6 @@
 trigger: none  # Explicitly scheduled for PRs
 
 variables:
-  - group: "BuildXL Secrets"
   - group: "BuildXL Common variables"
   - name: BuildXL.LogsDirectory.LKG
     value: $(Build.SourcesDirectory)\Out\Logs\pr-$(Build.BuildNumber)-lkg

.azdo/rolling/pipeline.yml

@@ -8,10 +8,6 @@ trigger:
     - Examples
   
 variables:
-# [NOTE]: We intentionally not include the "BuildXL Secrets" variable group here,
-#         and rather do it individually for every job that actually requires it:
-#         we especially want to avoid the external validations to access those secrets,
-#         which give access to internal resources.
 - group: "BuildXL Common variables"
 - template: variables.yml
 - name: isPublishingBranch
@@ -63,16 +59,12 @@ extends:
 
     - stage: RCIT
       displayName: RunCheckInTests
-      variables:
-      - group: "BuildXL Secrets"
       dependsOn: prepare
       jobs:
       - template: .azdo/rolling/jobs/run-checkin-tests.yml@self
 
     - stage: Linux
       displayName: Linux
-      variables:
-       - group: "BuildXL Secrets"
       dependsOn: prepare
       jobs:
       - template: .azdo/rolling/jobs/linux.yml@self