Improve organization of CI workflow scripts and pip requirements (#45037)

.github/workflows/bin/setup_git.ps1

@@ -0,0 +1,10 @@
+# (c) 2022 Lawrence Livermore National Laboratory
+
+git config --global user.email "spack@example.com"
+git config --global user.name "Test User"
+git config --global core.longpaths true
+
+if ($(git branch --show-current) -ne "develop")
+{
+    git branch develop origin/develop
+}