[devops] Don't checkout tags. (#21499)

This should speed up the checkout step a little bit.

Ref: https://github.com/xamarin/yaml-templates/pull/338.

tools/devops/automation/templates/common/checkout.yml

@@ -21,6 +21,7 @@ steps:
     clean: true
     submodules: recursive
     path: s/xamarin-macios
+    fetchTags: false
 
 - pwsh: ./undo_github_merge.ps1 -SourceBranch "$(Build.SourceBranch)" -IsPr "${{ parameters.isPR }}"
   name: fix_commit
@@ -32,9 +33,11 @@ steps:
   clean: true
   fetchDepth: 0
   persistCredentials: true  # hugely important, else there are some scripts that check a single file from maccore that will fail
+  fetchTags: false
 
 - checkout: yaml-templates
   clean: true
+  fetchTags: false
 
 - pwsh: ./clean_git_vsts.ps1 -GithubToken "$(GitHub.Token)" -MaccorePath "$(System.DefaultWorkingDirectory)/maccore"
   displayName: 'Clean git mess from VSTS'

tools/devops/automation/templates/loc-translations.yml

@@ -24,6 +24,7 @@ steps:
     clean: true
     submodules: recursive
     path: s/xamarin-macios
+    fetchTags: false
 
 - ${{ if parameters.isPR }}:
   - pwsh: |

tools/devops/automation/templates/windows/reserve-mac.yml

@@ -29,9 +29,13 @@ steps:
     commit: ${{ parameters.commit }}
     clean: true
     path: s/xamarin-macios
+    fetchTags: false
 
 - checkout: maccore
+  clean: true
+  fetchDepth: 0
   persistCredentials: true  # hugely important, else there are some scripts that check a single file from maccore that will fail
+  fetchTags: false
 
 - pwsh: '& "$Env:SYSTEM_DEFAULTWORKINGDIRECTORY/$($Env:BUILD_REPOSITORY_NAME.Split(''/'')[1])/tools/devops/automation/scripts/show_bot_info.ps1"'
   displayName: 'Show Bot Info'