🌱 clusterctl: always use -n as the shorthand for --[target-]namespace

[apricote]

What this PR does / why we need it:

Consistently use -n as the shorthand for --[target-]namespace. The shorthand is a default in the kubernetes ecosystem, and many of the clusterctl cmds were already using it.

[k8s-ci-robot]

Hi @apricote. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[fabriziopandini]

/ok-to-test

[ykakarap]

/lgtm

[killianmuldoon]

/lgtm

[sbueringer]

/lgtm

[fabriziopandini]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

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[sbueringer]

/retest

[ykakarap]

/test pull-cluster-api-build-main