RFR: 2410: Introduce process killing finally block in GitCommits

[Zhao Song]

On Tue, 19 Nov 2024 18:39:41 GMT, Zhao Song <zsong at openjdk.org> wrote:

> Recently, I found that for pr-external container, in GitCommits, the exit of the git process could time out and then the process will be stuck in sleeping state and eat memory. With Pavel's suggestion, I think we should introduce the process killing finally block.

Thank you for the review!

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PR Comment: https://git.openjdk.org/skara/pull/1697#issuecomment-2486797604