Rework Marketing Request Template

[mfahlandt]

As the comms team have now communications channels with different audience, comms requests need to include the target audience.
Based on this, Comms can choose what are the fitting communication channels.
We also added the Option if writing drafts is needed.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[mfahlandt]

/assign @kaslin
/assign @chris-short

[ArvindParekh]

Suggesting a few grammar and typo fixes 👍🏻

[chris-short]

Please change the filename, please (you might need to change something else too if the filename is used elsewhere). comms-request.yaml is fine. We need to lose the word Marketing

[mfahlandt]

Regarding the selection of the communication channel, I fear that people might be overwhelmed with the choice of the options. My suggestion is that this falls with the responsibility of sig-contribex-comms as we might know better.
@chris-short

[k8s-ci-robot]

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