Remove redundant static_cast in container network type assignment

[Copilot]

Summary of the Pull Request

Removes unnecessary static_cast<enum WSLA_CONTAINER_NETWORK_TYPE> in WSLAContainerLauncher.cpp that became redundant after the member variable type was changed from int to the enum type.

PR Checklist

• Closes: N/A (addresses review feedback on Implement container network mode #13886)
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

The m_containerNetworkType member variable type was changed from int to WSLA_CONTAINER_NETWORK_TYPE in commit e0153c3, but the implementation still contained a static_cast when assigning to the options struct:

// Before
options.ContainerNetwork.ContainerNetworkType = static_cast<enum WSLA_CONTAINER_NETWORK_TYPE>(m_containerNetworkType);

// After
options.ContainerNetwork.ContainerNetworkType = m_containerNetworkType;

The cast is now unnecessary since both the source and destination are the same enum type. This improves type safety by removing the ability to bypass enum type checking.

Also added _codeql_detected_source_root to .gitignore to prevent committing this CodeQL build artifact.

Validation Steps Performed

• Code formatting validated with clang-format
• Code review and security scanning passed with no issues

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