Add azure-storage-blob and remove pytest-watch

pytest-watch + pipenv were causing problems when building the app in CI,
so pytest-watched was removed for the time being.

Pipfile

@@ -37,6 +37,7 @@ azure-mgmt-consumption = "*"
 adal = "*"
 azure-identity = "*"
 azure-keyvault = "*"
+azure-storage-blob = "*"
 
 [dev-packages]
 bandit = "*"
@@ -45,7 +46,6 @@ ipython = "*"
 ipdb = "*"
 pylint = "*"
 black = "*"
-pytest-watch = "*"
 factory-boy = "*"
 pytest-flask = "*"
 pytest-env = "*"