Move V1 into regular mypy call

[hmellor]

Once all code inside vllm/v1 is mypy compliant, this PR should be mergeable.

Relevant PRs that udpate typing in vllm/v1:

• Ensure that pid passed to kill_process_tree is int for mypy #17051
• Use @property and private field for data_parallel_rank_local #17053
• Improve static type checking in LoRAModelRunnerMixin #17104
• Use Transformers helper get_text_config() instead of checking for text_config #17105
• Fix static typing issues in v1/attention #17113

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[hmellor]

Closing for now. May revisit once ty is ready.