Disallow missing resource docs on upgrades (#2971)

Sets the `allowMissingDocs` ci-mgmt config to false to error on missing
resource docs. This maintains the current behaviour.

Part of pulumi/upgrade-provider#303

Author: VenelinMartinov

.ci-mgmt.yaml

@@ -34,6 +34,7 @@ goBuildParallelism: 2
 # Use `pulumi convert` for translating examples from TF to Pulumi.
 pulumiConvert: 1
 integrationTestProvider: true
+allowMissingDocs: false
 releaseVerification:
   nodejs: examples/bucket
   python: examples/bucket-py