Add documentation for allow_pre_post_step_overrides safety flag

[deepsm007]

https://issues.redhat.com/browse/DPTP-4575
openshift/ci-tools#4760

/cc @openshift/test-platform

/hold wait for above PR to merge

[deepsm007]

/ai pr_description

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[psalajova]

/lgtm

[openshift-ci]

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