Parametrize job cluster role and image

[piotrminkina]

Mainly implements #213 and additionally allows also specyfiying Cluster Role to be used with job images. These are changes that are needed in a hermetic, corporate environment with no direct access to the Internet and a zero-trust policy. I also made other improvements that I felt were appropriate, as a fresh person joining the project.

Constructive comments welcome — I'm a Golang newbie, albeit with a non-short programming experience.

[piotrminkina]

How to solve the reported problems that are not the result of my changes?

test/suite/zz_suite_test.go:6:2: dot-imports: should not use dot imports (revive)
	. "github.com/onsi/ginkgo/v2"
	^
test/suite/zz_suite_test.go:7:2: dot-imports: should not use dot imports (revive)
	. "github.com/onsi/gomega"
	^
test/suite/helm_test.go:7:2: dot-imports: should not use dot imports (revive)
	. "github.com/onsi/ginkgo/v2"
	^

[brandond]

Thanks for the PR! A couple nits but overall looks good.

[brandond]

LGTM, but tests appear to be failing due to the linter complaining about dot imports of the test DSL... if you want to take a shot at fixing that go for it, otherwise I'll fix it in another PR and you can rebase.

[piotrminkina]

@brandond I added an exclusion rule, exactly as they did in Istio: https://github.com/istio/client-go/blob/46ba363b2dc16d8cd575f17de240ca840db2f7cf/common/config/.golangci.yml#L259

[piotrminkina]

@brandond I can't merge. Will You plan?