chore: Add unit/slow/localmode and unit-test-v3 jobs to CI Health workflow (#5949)

* chore: Add unit/slow/localmode and unit-test-v3 jobs to CI Health workflow

* chore: specify job version

* chore: Split unit-test-v3 into per-submodule parallel CI Health projects

Run each v3 submodule's unit tests in its own CodeBuild project (one
worker each) so they execute in parallel instead of sequentially,
keeping wall-clock time within the 3h timeout. Project names retain the
unit-test-v3 substring so they reuse the existing UNIT_TEST_V3
metric/alarm definitions and fold into CIHealthCompositeAlarm.

* chore: Drive v3 unit tests via SUBMODULE env var on a single CI Health project

Mirror the v2 ci-unit-tests pattern: instead of four per-submodule
projects, use one unit-test-v3 project parameterized by the SUBMODULE
env var, triggered once per submodule by the workflow matrix so they
still run in parallel. Also fix the v2 unit-tests job to pass PY_VERSION
via a python-version matrix (matching pr-checks), instead of relying on
an unset tox envlist.

Author: lucasjia-aws

.github/workflows/ci-health.yml

@@ -36,3 +36,75 @@ jobs:
         with:
           project-name: sagemaker-python-sdk-ci-health-canaries-v2
           source-version: refs/heads/master-v2
+  unit-tests-v2:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["py39", "py310", "py311", "py312"]
+    steps:
+      - name: Configure AWS Credentials
+        uses: aws-actions/configure-aws-credentials@v4
+        with:
+          role-to-assume: ${{ secrets.CI_AWS_ROLE_ARN }}
+          aws-region: us-west-2
+          role-duration-seconds: 10800
+      - name: Run Unit Tests (${{ matrix.python-version }})
+        uses: aws-actions/aws-codebuild-run-build@v1
+        with:
+          project-name: sagemaker-python-sdk-ci-health-unit-tests
+          source-version: refs/heads/master-v2
+          env-vars-for-codebuild: |
+            PY_VERSION
+        env:
+          PY_VERSION: ${{ matrix.python-version }}
+  slow-tests-v2:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Configure AWS Credentials
+        uses: aws-actions/configure-aws-credentials@v4
+        with:
+          role-to-assume: ${{ secrets.CI_AWS_ROLE_ARN }}
+          aws-region: us-west-2
+          role-duration-seconds: 10800
+      - name: Run Slow Tests
+        uses: aws-actions/aws-codebuild-run-build@v1
+        with:
+          project-name: sagemaker-python-sdk-ci-health-slow-tests
+          source-version: refs/heads/master-v2
+  localmode-tests-v2:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Configure AWS Credentials
+        uses: aws-actions/configure-aws-credentials@v4
+        with:
+          role-to-assume: ${{ secrets.CI_AWS_ROLE_ARN }}
+          aws-region: us-west-2
+          role-duration-seconds: 10800
+      - name: Run Local Mode Tests
+        uses: aws-actions/aws-codebuild-run-build@v1
+        with:
+          project-name: sagemaker-python-sdk-ci-health-localmode-tests
+          source-version: refs/heads/master-v2
+  unit-test-v3:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        submodule: [sagemaker-core, sagemaker-train, sagemaker-serve, sagemaker-mlops]
+    steps:
+      - name: Configure AWS Credentials
+        uses: aws-actions/configure-aws-credentials@v4
+        with:
+          role-to-assume: ${{ secrets.CI_AWS_ROLE_ARN }}
+          aws-region: us-west-2
+          role-duration-seconds: 10800
+      - name: Run Unit Tests V3 for ${{ matrix.submodule }}
+        uses: aws-actions/aws-codebuild-run-build@v1
+        with:
+          project-name: sagemaker-python-sdk-ci-health-unit-test-v3
+          source-version: refs/heads/master
+          env-vars-for-codebuild: |
+            SUBMODULE
+        env:
+          SUBMODULE: ${{ matrix.submodule }}