drop unused zenhub github actions workflows

As far as I know we don't use Zenhub for anything anymore.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

.github/workflows/zenhub-assigned.yml

@@ -1,17 +0,0 @@
-name: Zenhub integration assigned
-on:
-  issues:
-    types:
-      - assigned
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: status-im/zenhub-automations@master
-        with:
-          GITHUB_TOKEN:  ${{ secrets.GITHUB_TOKEN }}
-          ZENHUB_API_KEY: ${{ secrets.ZENHUB_TOKEN }}
-          INPROG_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzMyODI1Mg
-          NEXT_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzMyNzk2MQ
-          REVIEW_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzIyNjk0MTA

.github/workflows/zenhub-branches.yml

@@ -1,15 +0,0 @@
-name: Zenhub integration branch
-on:
-  create:
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: status-im/zenhub-automations@master
-        with:
-          GITHUB_TOKEN:  ${{ secrets.GITHUB_TOKEN }}
-          ZENHUB_API_KEY: ${{ secrets.ZENHUB_TOKEN }}
-          INPROG_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzMyODI1Mg
-          NEXT_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzMyNzk2MQ
-          REVIEW_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzIyNjk0MTA

.github/workflows/zenhub-milestoned.yml

@@ -1,17 +0,0 @@
-name: Zenhub integration milestoned
-on:
-  issues:
-    types:
-      - milestoned
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: status-im/zenhub-automations@master
-        with:
-          GITHUB_TOKEN:  ${{ secrets.GITHUB_TOKEN }}
-          ZENHUB_API_KEY: ${{ secrets.ZENHUB_TOKEN }}
-          INPROG_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzMyODI1Mg
-          NEXT_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzMyNzk2MQ
-          REVIEW_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzIyNjk0MTA

.github/workflows/zenhub-pr.yml

@@ -1,20 +0,0 @@
-name: Zenhub integration PR
-on:
-  pull_request:
-    branches: [ develop ]
-    types:
-      - ready_for_review
-      - opened
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: status-im/zenhub-automations@master
-        if: github.event.pull_request.draft == false
-        with:
-          GITHUB_TOKEN:  ${{ secrets.GITHUB_TOKEN }}
-          ZENHUB_API_KEY: ${{ secrets.ZENHUB_TOKEN }}
-          INPROG_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzMyODI1Mg
-          NEXT_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzMyNzk2MQ
-          REVIEW_COLUMN: Z2lkOi8vcmFwdG9yL1BpcGVsaW5lLzIyNjk0MTA