Added fetchdepth to disable default shallow checkout in new pipelines (#220)

https://learn.microsoft.com/en-us/azure/devops/pipelines/yaml-schema/steps-checkout?view=azure-pipelines#shallow-fetch

`New pipelines created after the [September 2022 Azure DevOps sprint 209
update](https://learn.microsoft.com/en-us/azure/devops/release-notes/2022/sprint-209-update)
have Shallow fetch enabled by default and configured with a depth of 1.
Previously the default was not to shallow fetch. To check your pipeline,
view the Shallow fetch setting in the [pipeline settings
UI](https://learn.microsoft.com/en-us/azure/devops/pipelines/repos/azure-repos-git#shallow-fetch).`

Adding fetchdepth of 0 to disable default of shallow checkout for new
pipelines using mu_devops.

Author: apop5

Jobs/CreateBuildMatrix.yml

@@ -36,6 +36,7 @@ jobs:
 
     steps:
     - checkout: none
+      fetchDepth: 0
 
     - task: PowerShell@2
       name: CalculateMatrix

Steps/BuildPlatform.yml

@@ -71,6 +71,7 @@ steps:
 - ${{ if eq(parameters.checkout_self, true) }}:
   - checkout: self
     clean: true
+    fetchDepth: 0
     # Note: Depth cannot be limited if PR Eval is used. A pipeline may choose
     #       to use a shallow checkout if PR eval is not used.
 

Steps/PrGate.yml

@@ -83,6 +83,7 @@ steps:
 - ${{ if eq(parameters.checkout_self, true) }}:
   - checkout: self
     clean: true
+    fetchDepth: 0
     # Note: Depth cannot be limited if PR Eval is used
 
 - template: SetupPythonPreReqs.yml

Steps/RunPatchCheck.yml

@@ -24,6 +24,7 @@ pool:
 steps:
 - checkout: self
   clean: true
+  fetchDepth: 0
 
 - template: Steps/SetupPythonPreReqs.yml
 - script: |