Use testGenericJob on BaseWebhook tests.

[mbobrovskyi]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Use testGenericJob on testing BaseWebhook.

Which issue(s) this PR fixes:

Part of #3372

Special notes for your reviewer:

This is prepare PR for #3414.

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
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[mimowo]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mbobrovskyi, mimowo

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• pkg/controller/OWNERS [mimowo]

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: ddb98fe77c25f2a48d6f911bca25e4e99daab8ef