Set user agent for requests coming from the jobset controller to "jobset"

[imreddy13]

What type of PR is this?

What this PR does / why we need it:

Set a meaningful user agent for requests coming from the jobset controller eg: jobset/v0.2.0 (linux/amd64)

Which issue(s) this PR fixes:

Fixes #768

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Modified user agent for requests coming from the jobset controller. Action required: None.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: imreddy13
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[k8s-ci-robot]

Hi @imreddy13. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ahg-g]

/ok-to-test

[kannon92]

I'm a bit unfamilar with this.

Can you deploy on a cluster and share that this behaves as you expect?