[docs] Reduce amount of make targets required for a PR

[hughesjj]

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Describe the issue you're reporting

Can we make a new "alias" makefile target to reduce the number of make command needed to run before submitting a PR, as specified in contributing.md?

Currently, it's

  * Before submitting a PR, run the following commands from the root of the repository to ensure your new compone
nt is meeting the repo linting expectations:
    * `make checkdoc`
    * `make checkmetadata`
    * `make checkapi`
    * `make goporto`
    * `make crosslink`
    * `make gotidy`
    * `make genotelcontribcol`
    * `make genoteltestbedcol`
    * `make generate`
    * `make multimod-verify`
    * `make generate-gh-issue-templates`
    * `make addlicense`

but I'd rather have

.PHONY: prep-pr
prep-pr: checkdoc checkmetadata checkapi goporto crosslink gotidy genotelcontribcol genoteltestbedcol generatemultimod-verify generate-gh-issue-templates addlicense

Alternatively, we could make PR requirements a precommit hook, but that would require contributors setting up precommit. Given the "heft" of these commands, it'd probably better to specifically use a pre-push hook

As an aside, it'd be nice to have a docs label or similar for issues like this.

[atoulme]

Sounds good, please feel free to offer a PR

[github-actions]

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