Use local policy.yaml file for Enterprise Contract

[simonbaird]

Rather than maintain a dependency on the ec configs at https://github.com/enterprise-contract/config let's use our own local config.

Notice that it uses a stable branch of the ec-policies repo rather than main branch. This is to reduce the change of unexpected breakages as new things are added to the ec-policies repo main branch.

Ref: https://issues.redhat.com/browse/EC-605

[openshift-ci]

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[simonbaird]

This is an alternative to #40. I think it's better since it removes the dependency on that enterprise-contract/config repo.

[simonbaird]

Another option would be to create a separate git repo just for the policy.yaml file.

[openshift-ci]

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

Test name	Commit	Details	Required	Rerun command
ci/prow/rhtap-sample-pipelines-yamllint	12f178a	link	false	/test rhtap-sample-pipelines-yamllint
ci/prow/rhtap-sample-pipelines-on-pull-request	12f178a	link	true	/test rhtap-sample-pipelines-on-pull-request

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[simonbaird]

As per slack discussion, the plan is to move forward with #40 in the short term, and revisit this in future. Converting to draft.

[openshift-merge-robot]

PR needs rebase.

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