feat: adding job run cancelling feature

[0x0elliot]

Closes #554

✅ Checklist

• I have followed every step in the contributing guide
• The PR title follows the convention.
• I ran and tested the code works

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Testing

• Verified the SDK change
• Verified the API change

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Changelog

Added in the requested features.

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[0x0elliot]

draft because i need to do some testing before i give thumbs up

[0x0elliot]

saw a bug in the SDK. let me fix that before the review.

[0x0elliot]

should be good now!

[ericallam]

Thanks @0x0elliot for your attempt! There is another PR open for this feature as well #562 that is a little closer to what we were looking for. You can either:

• Work with @hmacr on feat: allow cancelling jobs from trigger-client sdk #562 to get the feature over the line
• Update this PR to be more in-line with feat: allow cancelling jobs from trigger-client sdk #562 while addressing the review comments I left there
• Close this PR