[CICD] Migrate CI runners to FlagCICD runner set

[Darryl233]

ci: Migrate CI runners to FlagCICD runner set and fix git workspace mount in containers

Changes across 5 workflow files (qa-l0-pytorch-wheel, qa-l0-te-cpp-unittest-pytorch-lint, qa-l1-te-cpp-pytorch-tests, qa-l3-te-pytorch-fa-versions-test, te-plugin-tests):

• Runner migration: Replace runs-on: [self-hosted, Linux, X64, nvidia, gpu-8] with [dx4-nvidia-8gpu-v1] to adopt the new compute platform.
• Workspace volume mount: Add -v /home/runner/_work/${{ github.run_id }}:${{ github.workspace }} to container options so the host workspace is correctly mounted inside the container.
• Fix git safe.directory: Add a git config --global --add safe.directory '*' step before checkout to resolve git failures caused by directory ownership mismatches inside the container.

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1 out of 2 committers have signed the CLA.

✅ Darryl233
❌ liyuzhuo

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