Revert "ci: add manual R2 integration workflow"

This reverts commit 7b2b450c07.

.github/workflows/s3-r2-manual.yml

@@ -1,50 +0,0 @@
-name: S3-Compatible Integration (R2 Manual)
-permissions: {}
-
-on:
-  workflow_dispatch:
-
-defaults:
-  run:
-    shell: bash
-
-jobs:
-  s3-compatible-r2:
-    name: S3-Compatible Integration (R2)
-    runs-on: ubuntu-24.04
-    timeout-minutes: 45
-
-    steps:
-      - name: Install dependencies Ubuntu
-        run: sudo apt-get update && sudo apt-get install -y --no-install-recommends openssl build-essential libmariadb-dev-compat libpq-dev libssl-dev pkg-config
-
-      - name: Checkout
-        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
-        with:
-          persist-credentials: false
-          fetch-depth: 0
-
-      - name: Install rust-toolchain version
-        uses: dtolnay/rust-toolchain@f7ccc83f9ed1e5b9c81d8a67d7ad1a747e22a561
-        with:
-          toolchain: stable
-
-      - name: Show environment
-        run: |
-          rustc -vV
-          cargo -vV
-
-      - name: Rust Caching
-        uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2.8.2
-        with:
-          prefix-key: "v2025.09-rust"
-
-      - name: Run R2 integration test
-        env:
-          VW_S3_MINIO_ENDPOINT: ${{ secrets.VW_R2_ENDPOINT }}
-          VW_S3_MINIO_BUCKET: ${{ secrets.VW_R2_BUCKET }}
-          VW_S3_MINIO_ROOT: ${{ secrets.VW_R2_ROOT }}
-          VW_S3_MINIO_REGION: ${{ secrets.VW_R2_REGION }}
-          VW_S3_MINIO_ACCESS_KEY: ${{ secrets.VW_R2_ACCESS_KEY_ID }}
-          VW_S3_MINIO_SECRET_KEY: ${{ secrets.VW_R2_SECRET_ACCESS_KEY }}
-        run: cargo test --profile ci --features s3 config::s3_tests::test_s3_minio_integration_put_get_delete -- --ignored --nocapture