chore: import upstream snapshot with attribution

.github/workflows/protos.yml

@@ -0,0 +1,73 @@
+name: Protos
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    paths:
+      - .github/workflows/protos.yml
+      - dev/gen_rest_api.py
+      - dev/generate_protos.py
+      - dev/generate-protos.sh
+      - dev/test-generate-protos.sh
+      - mlflow/protos/**
+      - mlflow/java/client/src/main/java/com/databricks/api/proto/**
+      # graphql related code changes could trigger changes in the autogenerated schema
+      - mlflow/server/graphql/**
+      - mlflow/server/js/src/graphql/**
+      - requirements/skinny-requirements.yaml
+      - requirements/core-requirements.yaml
+
+env:
+  MLFLOW_HOME: ${{ github.workspace }}
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.ref }}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash
+
+permissions: {}
+
+jobs:
+  protos:
+    if: github.event_name != 'pull_request' || (github.event.pull_request.draft == false || github.event.pull_request.user.login == 'Copilot' && github.event.pull_request.user.type == 'Bot')
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+          repository: ${{ github.event.inputs.repository }}
+          ref: ${{ github.event.inputs.ref }}
+      - uses: ./.github/actions/setup-python
+      - name: Check OpenTelemetry protos are up-to-date
+        run: |
+          ./mlflow/protos/opentelemetry/update.sh
+          GIT_STATUS="$(git status --porcelain mlflow/protos/opentelemetry/)"
+          if [ "$GIT_STATUS" ]; then
+            echo "OpenTelemetry proto files are outdated. Please run './mlflow/protos/opentelemetry/update.sh'"
+            echo "Git status:"
+            echo "$GIT_STATUS"
+            exit 1
+          fi
+      - name: Run tests
+        run: |
+          ./dev/test-generate-protos.sh
+
+      - name: Test
+        run: |
+          uv run python -c "from google.protobuf.internal import api_implementation; assert api_implementation.Type() != 'python'"
+          uv run python -c "import mlflow"
+
+          # Ensure mlflow works fine with the python backend. See the following link for more details:
+          # https://github.com/protocolbuffers/protobuf/tree/main/python#implementation-backends
+          export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python
+          uv run python -c "from google.protobuf.internal import api_implementation; assert api_implementation.Type() == 'python'"
+          uv run python -c "import mlflow"