Feat/keep release jobs

[wileyj]

long running nit i had for the workflow cleanup job - it would delete release workflows and i think at a minimum those are worth keeping or at least keeping for much longer since stacks-core is released infrequently.

this change addresses that nit so it will not delete ci.yml workflows for a release.

after i tested this change though, i noticed another field in the actions json that i think might make the jq easier to read:
"event": "workflow_dispatch",

so the filter i currently have of:

| select((.head_branch | test("release/")) and (.name | test("release/") | not) or (.head_branch | test("release/") | not) )

may be more easily written like:

select((.head_branch | test("release/") | not) and ( .event != "workflow_dispatch" ))

untested, but i think it should work. alternatively, the more verbose select stmt proposed in this PR also would work.