(UI) Move common prop sets (based on flows/experiment status) to central location

[data-sync-user]

We have a lot of sets of properties for various experiment flows and/or states for use in Storybook, testing, and in our mutations. It feels like these could go in some sort of shared location, or a shared flow/prop mock file and another for reference in the UI.

We have some great "[state]BaseProps" in ChangeApprovalOperations mocks. I think we can pull these out to a higher level to use across stories where applicable, there's likely other stories (and potentially tests) like in AppLayoutWithSidebar and LinkNavSummary tests that could pull from a shared place, and we have other "base props" set up in Summary mocks as well as in PageSummary.

Additionally, we have a lot of flow actions for mutations that correspond to similar sets of "flow props". See this in PageSummary as well as one in Summary.

There may be other similar instances - just mostly feels like this could use some consolidation and something that can make these properties/objects correspond with a kind of flow or action would feel a bit cleaner.

Related, fixing up how we're checking for statuses: EXP-1158 / #5643

┆Issue is synchronized with this Jira Task

[jaredlockhart]

@lmorchard if you feel like doing this soon then great, if not then just close this as a wontfix 👍