Remove default_branch config for new repos

- fix failing org automation after #802:
  Cannot update default branch for an empty repository
- need to wait until repos got transferred before changing default branch

Author: stephanme

org/cloudfoundry.yml

@@ -261,7 +261,6 @@ orgs:
         has_wiki: false
       bosh_exporter:
         description: BOSH Prometheus Exporter
-        default_branch: master
         has_projects: false
       bosh-gcscli:
         description: GCS for BOSH
@@ -565,7 +564,6 @@ orgs:
         has_projects: true
       cf_exporter:
         description: Cloud Foundry Prometheus Exporter
-        default_branch: master
         has_projects: false
       cf-for-k8s:
         archived: true
@@ -1215,7 +1213,6 @@ orgs:
         has_projects: true
       firehose_exporter:
         description: Cloud Foundry Firehose Prometheus exporter
-        default_branch: master
         has_projects: false
       filelock:
         has_projects: true
@@ -1797,7 +1794,6 @@ orgs:
         has_projects: true
       node-exporter-boshrelease:
         description: Prometheus Node Exporter BOSH Release
-        default_branch: master
         has_projects: false
       nodejs-buildpack:
         description: Cloud Foundry buildpack for Node.js
@@ -1917,7 +1913,6 @@ orgs:
         has_projects: true
       prometheus-boshrelease:
         description: bosh release for prometheus ecosystem
-        default_branch: master
         has_projects: false
       public-buildpacks-ci-robots:
         default_branch: main