chore: delete housekeeping workflows (#41487)

Latest changes enforced by GitHub prevents using the action in dependabot's PR's context. See: https://github.com/ahmadnassri/action-dependabot-auto-merge/issues/60, https://github.blog/changelog/2021-02-19-github-actions-workflows-triggered-by-dependabot-prs-will-run-with-read-only-permissions

Regardless of the above we also moved to needing atleast two approvals

Removing this workflow for now.

.github/dependabot.yml

@@ -1,30 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: npm
-    directory: '/client'
-    schedule:
-      interval: 'weekly'
-    open-pull-requests-limit: 20
-    labels:
-      - 'dependabot'
-      - 'platform: client'
-  - package-ecosystem: npm
-    directory: '/api-server'
-    schedule:
-      interval: 'weekly'
-      day: 'sunday'
-    ignore:
-      - dependency-name: 'mongodb'
-    open-pull-requests-limit: 20
-    labels:
-      - 'dependabot'
-      - 'platform: api'
-  - package-ecosystem: npm
-    directory: '/curriculum'
-    schedule:
-      interval: 'weekly'
-      day: 'sunday'
-    open-pull-requests-limit: 20
-    labels:
-      - 'dependabot'
-      - 'scope: curriculum'

.github/workflows/housekeeping.yml

@@ -1,15 +0,0 @@
-name: Housekeeping
-
-on:
-  pull_request
-
-jobs:
-  automerge:
-    runs-on: ubuntu-latest
-    if: github.actor == 'dependabot[bot]'
-    steps:
-      - name: 'Merge Minor SemVer Updates'
-        uses: ahmadnassri/action-dependabot-auto-merge@master
-        with:
-          target: minor
-          github-token: ${{ secrets.AUTO_MERGE_TOKEN }}