hack: quote YAML_OUTPUT_DIR in rm command to prevent word-splitting

[Ankitsinghsisodya]

Fixes #8989

Summary

• Quote ${YAML_OUTPUT_DIR} in the rm -fr call in hack/generate-yamls.sh

Without quotes, a path containing spaces causes word-splitting and may silently delete files in the wrong location.

[knative-prow]

Hi @Ankitsinghsisodya. Thanks for your PR.

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[Copilot]

Pull request overview

Updates the YAML generation helper script to avoid shell word-splitting risks when cleaning the output directory.

Changes:

• Quote ${YAML_OUTPUT_DIR} in the rm -fr cleanup command to safely handle paths containing spaces.

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[evankanderson]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Ankitsinghsisodya, evankanderson
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[knative-prow]

@Ankitsinghsisodya: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
unit-tests_eventing_main	2ebb215	link	true	/test unit-tests

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