ZTS: Remove functional tests via matrix

This commit changes the workflow of the github actions.

- Ubuntu 20.04, 22.04, 24.04 will be tested via QEMU now
- remove unused scripts of this commit: b7bc334d1
- re-add the zloop standalone testings via zloop.yml

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Tino Reichardt <milky-zfs@mcmilk.de>
Closes #16549

.github/workflows/zloop.yml

@@ -0,0 +1,61 @@
+name: zloop
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  zloop:
+    runs-on: ubuntu-24.04
+    env:
+      TEST_DIR: /var/tmp/zloop
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+    - name: Install dependencies
+      run: |
+        sudo apt-get purge -y snapd google-chrome-stable firefox
+        ONLY_DEPS=1 .github/workflows/scripts/qemu-3-deps.sh ubuntu24
+    - name: Autogen.sh
+      run: |
+        sed -i '/DEBUG_CFLAGS="-Werror"/s/^/#/' config/zfs-build.m4
+        ./autogen.sh
+    - name: Configure
+      run: |
+        ./configure --prefix=/usr --enable-debug --enable-debuginfo \
+           --enable-asan --enable-ubsan \
+           --enable-debug-kmem --enable-debug-kmem-tracking
+    - name: Make
+      run: |
+        make -j$(nproc)
+    - name: Install
+      run: |
+        sudo make install
+        sudo depmod
+        sudo modprobe zfs
+    - name: Tests
+      run: |
+        sudo mkdir -p $TEST_DIR
+        # run for 10 minutes or at most 6 iterations for a maximum runner
+        # time of 60 minutes.
+        sudo /usr/share/zfs/zloop.sh -t 600 -I 6 -l -m1 -- -T 120 -P 60
+    - name: Prepare artifacts
+      if: failure()
+      run: |
+        sudo chmod +r -R $TEST_DIR/
+    - uses: actions/upload-artifact@v4
+      if: failure()
+      with:
+        name: Logs
+        path: |
+          /var/tmp/zloop/*/
+          !/var/tmp/zloop/*/vdev/
+        if-no-files-found: ignore
+    - uses: actions/upload-artifact@v4
+      if: failure()
+      with:
+        name: Pool files
+        path: |
+          /var/tmp/zloop/*/vdev/
+        if-no-files-found: ignore