fix: Site build polling and latest build branch

[apburnes]

Closes #4650 and #4648

Changes proposed in this pull request:

• Adds react-query to manage api calls and polling for site builds
• Simplifies the tagging of the latest, completed build branches
• Removes fetch builds from redux state
• Creates useBuilds and useRebuild hooks to fetch and mutate site builds respectively

security considerations

Adds new dependency react-query to manage http calls

[cloud-gov-pages-operations]

:robot: This is an automated code coverage report

Total coverage (lines): 14.56% Coverage diff: 9.08% :chart_with_upwards_trend: