[release-1.8] 🐛 KCP: remove etcd member in pre-terminate hook

[sbueringer]

What this PR does / why we need it:
Manual cherry-pick of #11137

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 #

[sbueringer]

/test pull-cluster-api-e2e-conformance-ci-latest-release-1-8
/test pull-cluster-api-e2e-conformance-release-1-8
/test pull-cluster-api-e2e-mink8s-release-1-8
/test pull-cluster-api-e2e-release-1-8
/test pull-cluster-api-e2e-upgrade-1-30-1-31-release-1-8

[sbueringer]

/test pull-cluster-api-e2e-conformance-ci-latest-release-1-8
/test pull-cluster-api-e2e-conformance-release-1-8
/test pull-cluster-api-e2e-mink8s-release-1-8
/test pull-cluster-api-e2e-release-1-8
/test pull-cluster-api-e2e-upgrade-1-30-1-31-release-1-8

[sbueringer]

/test pull-cluster-api-e2e-conformance-ci-latest-release-1-8
/test pull-cluster-api-e2e-conformance-release-1-8
/test pull-cluster-api-e2e-mink8s-release-1-8
/test pull-cluster-api-e2e-release-1-8
/test pull-cluster-api-e2e-upgrade-1-30-1-31-release-1-8

[sbueringer]

This PR is a squashed cherry-pick of #11137 as of now

/hold

until #11137 is merged

[sbueringer]

/test pull-cluster-api-e2e-conformance-ci-latest-release-1-8
/test pull-cluster-api-e2e-conformance-release-1-8
/test pull-cluster-api-e2e-mink8s-release-1-8
/test pull-cluster-api-e2e-release-1-8
/test pull-cluster-api-e2e-upgrade-1-30-1-31-release-1-8

[chrischdi]

/lgtm
/approve

Compared the diffs

git diff origin/main...sbueringer/pr-kcp-pre-terminate > diff-main.diff
git diff origin/release-1.8...sbueringer/pr-kcp-pre-terminate-1.8 > diff-1.8.diff
diff  diff-1.8.diff diff-main.diff

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 6ddafb77e3e81ad0aae5c155f45faa7b4b7e6546

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrischdi

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• OWNERS [chrischdi]

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[sbueringer]

/hold cancel

[sbueringer]

/override pull-cluster-api-e2e-blocking-release-1-8

No need to retest before merge. We only merged a doc PR in between

[k8s-ci-robot]

@sbueringer: Overrode contexts on behalf of sbueringer: pull-cluster-api-e2e-blocking-release-1-8

In response to this:

/override pull-cluster-api-e2e-blocking-release-1-8

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