Generate files with correct owner

[cgilmour]

When preparing modifications to this repo, the pre-commit hook uses docker to run some containers and tools to generate code.
The files produced in those steps end up being owned by root instead of the current user.
This causes some problems, eg: when switching branches.
It can be manually cleaned up with sudo chown -R "$USER" .

This change makes sure the generated files are owned by the current user instead, avoiding the problem and cleanup.

[istio-testing]

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This pull-request has been approved by: cgilmour
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[istio-testing]

Hi @cgilmour. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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