feat: Automatically update build status on site build history page

[apburnes]

Closes https://github.com/cloud-gov/pages-core/issues/4529 Closes https://github.com/cloud-gov/private/issues/1418

Changes proposed in this pull request:

• Adds a new feature to automatically update a sites build task status
• Improves developer experience by providing mock report json data for site build tasks.

security considerations

None

[apburnes]

@drewbo I was thinking about switching to a feature flag for the dev reports.

• For the build auto updates, I want the page to continue to update so new builds created by others would populate the page. Maybe we put logic to only refetch builds if the page is in focus. For the odd jump in build time since, it appears to be a subcomponent state re-rendering. I'll take a look.

[apburnes]

@drewbo

• Switched to a feature flag for dev reports
• Added a document.hasFocus method to only fetch while the user is on the page
• Created refetchBuilds action to avoid the multi-state update on subsequent build fetches.