Additional improvements to CI (#8303)

* Wait until budget check is complete

* Ensure that multi-GPU tests run for the master branch

* Fix

tests/buildkite/conftest.ps1

@@ -6,6 +6,8 @@ if ( $Env:BUILDKITE_PULL_REQUEST -and ($Env:BUILDKITE_PULL_REQUEST -ne "false")
 
 if ( ($Env:BUILDKITE_BRANCH -eq "master") -or ($Env:BUILDKITE_BRANCH -match "release_.+") ) {
   $is_release_branch = 1
+  $enforce_daily_budget = 0
 } else {
   $is_release_branch = 0
+  $enforce_daily_budget = 1
 }