Drop Bazel 7 tests for bazel, java, and partially cpp and python.

C++, PHP, Ruby and upb still have some cross-compilation Bazel 7 tests.

PiperOrigin-RevId: 855074337

Author: anandolee

.bazelci/presubmit.yml

@@ -1,7 +1,7 @@
 # LINT.IfChange(bazelci_presubmit)
 matrix:
   platform: ["debian10", "macos", "macos_arm64", "ubuntu2004", "windows"]
-  bazel: [7.x, 8.x]
+  bazel: [8.x]
 
 tasks:
   verify_targets:

.bcr/presubmit.yml

@@ -3,7 +3,7 @@ bcr_test_module:
   module_path: examples
   matrix:
     platform: ["debian10", "macos", "macos_arm64", "ubuntu2004", "windows"]
-    bazel: [7.x, 8.x]
+    bazel: [8.x]
 
   tasks:
     verify_targets:

.github/workflows/test_bazel.yml

@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         runner: [ ubuntu, windows, macos ]
-        bazelversion: [ '7.6.1', '8.0.0' ]
+        bazelversion: [ '8.0.0' ]
         bzlmod: [ true, false ]
         toolchain_resolution:
           # Default flags, uses from-source protoc
@@ -87,4 +87,4 @@ jobs:
           version: ${{ matrix.bazelversion }}
           bash: >
             cd examples/example_without_cc_toolchain;
-            bazel build //... $BAZEL_FLAGS --enable_bzlmod=true ${{ matrix.toolchain_resolution }};
+            bazel build //... $BAZEL_FLAGS ${{ matrix.toolchain_resolution }};

.github/workflows/test_cpp.yml

@@ -44,10 +44,6 @@ jobs:
             cache_key: Bazel7bzlmod
             image: "us-docker.pkg.dev/protobuf-build/containers/common/linux/bazel:7.6.1-e0df73e51131ccaf53451355d22577f377357604"
             targets: "//src/... //third_party/utf8_range/..."
-          - config: { name: "Bazel7 Workspace", flags: --noenable_bzlmod }
-            cache_key: Bazel7nobzlmod
-            image: "us-docker.pkg.dev/protobuf-build/containers/common/linux/bazel:7.6.1-e0df73e51131ccaf53451355d22577f377357604"
-            targets: "//src/... //third_party/utf8_range/..."
           - config: { name: "Bazel8", flags: --cxxopt="-Wno-self-assign-overloaded" }
             cache_key: Bazel8
             image: "us-docker.pkg.dev/protobuf-build/containers/common/linux/bazel:8.0.1-e78301df86b3e4c46ec9ac4d98be00e19305d8f3"

.github/workflows/test_java.yml

@@ -48,11 +48,6 @@ jobs:
             cache_key: 'bazel7bzlmod'
             image: us-docker.pkg.dev/protobuf-build/containers/common/linux/bazel:7.6.1-e0df73e51131ccaf53451355d22577f377357604
             targets: //java/... //java/internal:java_version //compatibility/...
-          - name: Bazel7 Workspace
-            cache_key: 'bazel7nobzlmod'
-            image: us-docker.pkg.dev/protobuf-build/containers/common/linux/bazel:7.6.1-e0df73e51131ccaf53451355d22577f377357604
-            targets: //java/... //java/internal:java_version //compatibility/...
-            flags: --noenable_bzlmod
           # TODO: b/395623141 - restore this test once runtime uses / emulates aarch64.
           # - name: aarch64
           #   cache_key: 'aarch64'

.github/workflows/test_python.yml

@@ -64,7 +64,7 @@ jobs:
         if: ${{ !matrix.continuous-only || inputs.continuous-run }}
         uses: protocolbuffers/protobuf-ci/bazel-docker@v5
         with:
-          image: ${{ matrix.image || format('us-docker.pkg.dev/protobuf-build/containers/test/linux/python:7.6.1-{0}-5237f14696e60e4b050edfbf7ba9b374f37f83c6', matrix.version) }}
+          image: ${{ matrix.image || format('us-docker.pkg.dev/protobuf-build/containers/test/linux/python:8.0.1-{0}-5237f14696e60e4b050edfbf7ba9b374f37f83c6', matrix.version) }}
           credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
           bazel-cache: python_linux/${{ matrix.type }}_${{ matrix.version }}
           bazel: test ${{ matrix.targets }} ${{ matrix.flags }} ${{ matrix.nobzlmod && '--noenable_bzlmod' || '' }} --test_env=KOKORO_PYTHON_VERSION
@@ -115,7 +115,7 @@ jobs:
         env:
           KOKORO_PYTHON_VERSION: ${{ matrix.version }}
         with:
-          version: 7.6.1 # Bazel version
+          version: 8.0.1 # Bazel version
           credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
           bazel-cache: python_macos/${{ matrix.type }}_${{ matrix.version }}
           bazel: >-