Add more PR checklist files

.github/workflows/pr-code-coverage.yml

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+name: Run CI
+on:
+  pull_request
+jobs:
+  test:
+    name: Code coverage (PHP 7.4, WP Latest)
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+    services:
+      database:
+        image: mysql:5.6
+        env:
+          MYSQL_ROOT_PASSWORD: root
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=5
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 100
+
+      - name: Checkout submodules
+        run: git submodule update --init --recursive
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.4
+          tools: composer
+          extensions: mysql
+          coverage: none
+
+      - name: Tool versions
+        run: |
+          php --version
+          composer --version
+      - name: Get cached composer directories
+        uses: actions/cache@v2
+        with:
+          path: |
+            ./packages
+            ./vendor
+          key: ${{ runner.os }}-${{ hashFiles('./composer.lock') }}
+
+      - name: Setup and install composer
+        run: composer install
+
+      - name: Init DB and WP
+        run: ./tests/bin/install.sh woo_test root root 127.0.0.1 latest
+
+      - name: Run unit tests with code coverage. Allow to fail.
+        run: |
+          RUN_CODE_COVERAGE=1 bash ./tests/bin/phpunit.sh
+          exit 0
+      - name: Send code coverage to Codecov.
+        run: |
+          bash <(curl -s https://codecov.io/bash) -t 2c81bcb5-5d5d-4b82-a0d0-56bdfad8422d

.github/workflows/pr-code-sniff.yml

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+name: Run code sniff on PR
+on:
+  pull_request
+jobs:
+  test:
+    name: Code sniff (PHP 7.4, WP Latest)
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+    services:
+      database:
+        image: mysql:5.6
+        env:
+          MYSQL_ROOT_PASSWORD: root
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=5
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Checkout submodules
+        run: git submodule update --init --recursive
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.4
+          tools: composer
+          extensions: mysql
+          coverage: none
+
+      - name: Tool versions
+        run: |
+          php --version
+          composer --version
+      - name: Get cached composer directories
+        uses: actions/cache@v2
+        with:
+          path: |
+            ./packages
+            ./vendor
+          key: ${{ runner.os }}-${{ hashFiles('./composer.lock') }}
+
+      - name: Setup and install composer
+        run: composer install
+
+      - name: Init DB and WP
+        run: ./tests/bin/install.sh wpadcenter_test root root 127.0.0.1 latest
+
+      - name: Run code sniff
+        run: RUN_PHPCS=1 bash ./tests/bin/phpcs.sh

.github/workflows/pr-unit-tests.yml

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+name: Run unit tests on PR
+on:
+  pull_request
+jobs:
+  test:
+    name: PHP ${{ matrix.php }} WP ${{ matrix.wp }}
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [ '7.0', '7.1', '7.2', '7.3', '7.4', '8.0' ]
+        wp: [ "latest" ]
+        include:
+        - wp: nightly
+          php: '7.4'
+        - wp: '5.5'
+          php: 7.2
+        - wp: '5.4'
+          php: 7.2
+    services:
+      database:
+        image: mysql:5.6
+        env:
+          MYSQL_ROOT_PASSWORD: root
+        ports:
+        - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=5
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Checkout submodules
+      run: git submodule update --init --recursive
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+        tools: composer
+        extensions: mysql
+        coverage: none
+
+    - name: Tool versions
+      run: |
+        php --version
+        composer --version
+    - name: Get cached composer directories
+      uses: actions/cache@v2
+      with:
+        path: |
+          ./packages
+          ./vendor
+        key: ${{ runner.os }}-${{ hashFiles('./composer.lock') }}
+
+    - name: Setup and install composer
+      run: composer install
+
+    - name: Add PHP8 Compatibility.
+      run: |
+        if [ "$(php -r "echo version_compare(PHP_VERSION,'8.0','>=');")" ]; then
+           curl -L https://github.com/woocommerce/phpunit/archive/add-compatibility-with-php8-to-phpunit-7.zip -o /tmp/phpunit-7.5-fork.zip
+           unzip -d /tmp/phpunit-7.5-fork /tmp/phpunit-7.5-fork.zip
+           composer bin phpunit config --unset platform
+           composer bin phpunit config repositories.0 '{"type": "path", "url": "/tmp/phpunit-7.5-fork/phpunit-add-compatibility-with-php8-to-phpunit-7", "options": {"symlink": false}}'
+           composer bin phpunit require --dev -W phpunit/phpunit:@dev --ignore-platform-reqs
+         fi
+    - name: Init DB and WP
+      run: ./tests/bin/install.sh woo_test root root 127.0.0.1 ${{ matrix.wp }}
+
+    - name: Run tests
+      run: ./vendor/bin/phpunit -c ./phpunit.xml