Decompose complicated go-style reusable into composite actions

[krsna-m]

See this todo:

actions/.github/workflows/reusable-style.yaml

Lines 71 to 72 in 19bb67f

	# TODO: This should be broken down into composites like the rest
	uses: knative/actions/.github/workflows/reusable-helper-go-style.yaml@main

We currently have a [reusable-helper-go-style.yaml](https://github.com/knative/actions/blob/main/.github/workflows/reusable-helper-go-style.yaml) that should really be decomposed down in to composite actions. An example gofmt one already exists here.

While doing this, one could take a look at #65 and see what things we can improve on.

[nitishchauhan0022]

/assign