Setup github team and slack alias for the release team

[ykakarap]

Detailed Description:
For the newly created release team for v1.4 cycle lets create a github team and a slack alias for the team.

Part of #7389

/assign

[ykakarap]

• PR for github team: add cluster-api-release-team github team kubernetes/org#3802
• PR for slack alias: User group for Cluster API release team kubernetes/community#6920

[sbueringer]

/triage accepted

[sbueringer]

Final tasks:

• add joekr to cluster-api-release-team kubernetes/org#3827
• add joekr to cluster-api-release-team slack alias kubernetes/community#6962

[sbueringer]

PRs all merged

Thx for taking care of this!

/close

[k8s-ci-robot]

@sbueringer: Closing this issue.

In response to this:

PRs all merged

Thx for taking care of this!

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.