🌱 drop the draft release notes step from github workflow

[ykakarap]

What this PR does / why we need it:

Since the release team is taking care of generating the release notes as needed, dropping the step from the github workflow.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[ykakarap]

cc @kubernetes-sigs/cluster-api-release-team

[cpanato]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d91553855915d234f301b1c47a972015c9b22e79

[joekr]

/lgtm

[hackeramitkumar]

+1
/lgtm

[nawazkh]

/lgtm+

[sbueringer]

/lgtm
/approve

I guess this PR is enough to change the workflow for all branches

Let's test it with the upcoming patch releases

(we can use this PR to figure out if that's how it works)

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 4f1aad33bc3491a7f45762efbe29b96d13a159b3

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[ykakarap]

I guess this PR is enough to change the workflow for all branches

I believe so. Since the workflow is triggered with a tag push and a tag push is not any branch specific, as far as git is considered, I believe the default branch will be used for the workflow.

We will know for sure during the next patch releases 😅

[sbueringer]

Looks like it didn't work for v1.3.3

Let's backport

[sbueringer]

/cherry-pick release-1.3

[sbueringer]

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #8032

In response to this:

/cherry-pick release-1.3

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[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #8033

In response to this:

/cherry-pick release-1.2

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