test/extended: Fix "avaiable" -> "available" typos

[wking]

Fixing typos from 273a9d8 (#23132) and 1899986 (#25039).

Generated with:

$ sed -i 's/avaiable/available/g' $(git grep -l avaiable)

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: wking
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[openshift-merge-robot]

@wking: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-agnostic-cmd	5614b0c	link	/test e2e-agnostic-cmd
ci/prow/e2e-gcp-upgrade	5614b0c	link	/test e2e-gcp-upgrade

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[openshift-bot]

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/lifecycle stale

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/lifecycle rotten
/remove-lifecycle stale

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/close

[openshift-ci-robot]

@openshift-bot: Closed this PR.

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