Minor fixes to e2e test make targets

[Tom-Newton]

Purpose of this PR

Make it a little easier to get started running the e2e tests.

Proposed changes:

• Correct a typo so now it matches the docs https://www.kubeflow.org/docs/components/spark-operator/developer-guide/#run-e2e-tests.
• Use $(KIND) so it uses the kind that was automatically installed rather than trying to find it on system path.

Change Category

Indicate the type of change by marking the applicable boxes:

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Checklist

Before submitting your PR, please review the following:

• I have conducted a self-review of my own code.
• I have updated documentation accordingly - I don't think there is need for an update.
• I have added tests that prove my changes are effective or that my feature works - I don't think this is applicable.
• Existing unit tests pass locally with my changes.

Additional Notes

[ChenYi015]

/lgtm

[ChenYi015]

@Tom-Newton Thanks for fixing this.

[ChenYi015]

There is a go lint error introduced in recent commits which fails the code check CI and has already been fixed. Could you do a rebase? Will merge this PR when all CI workflow has passed.

[Tom-Newton]

Rebased for the CI fix

[google-oss-prow]

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This pull-request has been approved by: ChenYi015

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[ChenYi015]

/lgtm