feat(release notes): add release notes doc and linter

[jcantrill]

Description

This PR:

• adds a release notes document that is generated from existing JIRAs or commits
• adds a linting script to ensure commit references JIRA and JIRA ref exists in the release notes

Links

cc @xperimental @pavolloffay @mwringe @vparfonov @Clee2691

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[jcantrill]

/hold

[openshift-ci]

@jcantrill: 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
ci/prow/lint	2a1768a	link	true	/test lint

Full PR test history. Your PR dashboard.

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[pavolloffay]

to make it nicer, it would be good to add a link to the jira.