Change command style for easier use & update docs

[psalajova]

Update the secret-manager CLI so it's in line with the new 3-tier hierarchy (see design doc).

Also changed the syntax to be like:

./secret-manager create -c my-creds aws/password -l "value"

./secret-manager delete -c my-creds aws/subgroup/password -l "value"

Instead of the previous --collection={} --secret={} format which would have been too verbose. .

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@psalajova: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@psalajova: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.

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