ci: Upload failed MacVim tests artifacts, misc improvements

Add new step to upload MacVim test results when we have failed tests.
The xcresult folder can be opened in Xcode for inspection to help
understand what went wrong. Also, fix the ordering so failed Vim GUI
test artifacts can be uploaded as well.

When configuring Vim, be explicit to not build with sodium/gettext for
the non-publish builds. This makes sure that even if the CI environment
somehow has them installed by default, we won't use them by mistake.
Those installed packages would be built for a different OS target anyway
and throw out warnings (the ones we bundle with MacVim are custom built
to target the proper OS versions).

.github/actions/test_macvim_artifacts/action.yml

@@ -0,0 +1,26 @@
+# This is a clone of test_artifacts for MacVim-specific files
+name: 'test_macvim_artifacts'
+description: "Upload failed MacVim test artifacts"
+runs:
+  using: "composite"
+  steps:
+    - name: Upload failed tests
+      uses: actions/upload-artifact@v4
+      with:
+        # Name of the artifact to upload.
+        name: ${{ github.workflow }}-${{ github.job }}-${{ join(matrix.*, '-') }}-failed-macvim-tests
+
+        # A file, directory or wildcard pattern that describes what
+        # to upload.
+        path: |
+         /Users/runner/Library/Developer/Xcode/DerivedData/MacVim-*/Logs/Test/*.xcresult
+        # The desired behavior if no files are found using the
+        # provided path.
+        if-no-files-found: ignore
+
+        # Duration after which artifact will expire in days. 0 means
+        # using repository settings.
+        retention-days: 0
+
+        # If true, an artifact with a matching name will be deleted
+        overwrite: true

.github/workflows/ci-macvim.yaml

@@ -207,6 +207,7 @@ jobs:
           else
             CONFOPT+=(
               --disable-sparkle       # Disable Sparkle for testing that this flag builds and works
+              --enable-nls=no --enable-libsodium=no # Disable gettext and libsodium unless we built them ourselves for publish
             )
           fi
           if ${{ matrix.legacy == true }}; then
@@ -354,6 +355,10 @@ jobs:
         run: |
           make ${MAKE_BUILD_ARGS} -C src macvim-tests
 
+      - name: Upload failed MacVim test results
+        if: ${{ !cancelled() && failure() }}
+        uses: ./.github/actions/test_macvim_artifacts
+
       - name: Build Vim test binaries
         run: |
           # Build the unit test binaries first. With link-time-optimization they take some time to link. Running them