ci: remove xcode github action

We're using xcode cloud now which seems much more reliable

.github/workflows/run-tests.yaml

@@ -1,32 +0,0 @@
-name: Run Test Suite 
-run-name: Testing ${{ github.ref }} by @${{ github.actor }}
-
-on:
-  push:
-    branches:
-      - "master"
-      - "ci"
-  pull_request:
-    branches:
-      - "*"
-
-
-jobs:
-  run_tests:
-    runs-on: macos-12
-    strategy:
-      matrix:
-        include:
-          - xcode: "14.2"
-            ios: "16.2"
-    
-    name: Test iOS (${{ matrix.ios }})
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v1
-      - name: Select Xcode
-        uses: maxim-lobanov/setup-xcode@v1
-        with:
-          xcode-version: ${{ matrix.xcode }}
-      - name: Run Tests 
-        run: xcodebuild test -scheme damus -project damus.xcodeproj -destination 'platform=iOS Simulator,name=iPhone 14,OS=${{ matrix.ios }}' | xcpretty && exit ${PIPESTATUS[0]}