[Uptime] Refactor snapshot tests to RTL

[andrewvc]

Refactoring these tests will reduce the number of updated snapshots (and reduce the number of codeowner pings)

https://github.com/elastic/kibana/blob/master/x-pack/plugins/uptime/public/components/certificates/__snapshots__/fingerprint_col.test.tsx.snap
https://github.com/elastic/kibana/blob/master/x-pack/plugins/uptime/public/components/common/__snapshots__/uptime_date_picker.test.tsx.snap
https://github.com/elastic/kibana/blob/master/x-pack/plugins/uptime/public/components/monitor/ml/__snapshots__/license_info.test.tsx.snap
https://github.com/elastic/kibana/blob/master/x-pack/plugins/uptime/public/components/monitor/ml/__snapshots__/ml_flyout.test.tsx.snap
https://github.com/elastic/kibana/blob/master/x-pack/plugins/uptime/public/compone[…]ty_reporting/__snapshots__/availability_reporting.test.tsx.snap
https://github.com/elastic/kibana/blob/master/x-pack/plugins/uptime/public/compone[…]lity_reporting/__snapshots__/location_status_tags.test.tsx.snap
https://github.com/elastic/kibana/blob/master/x-pack/plugins/uptime/public/components/overview/monitor_list/__snapshots__/monitor_list.test.tsx.snap

[elasticmachine]

Pinging @elastic/uptime (Team:uptime)

[justinkambic]

The list of components was chosen as a result of CODEOWNER pings on #99382. In the future when these types of upgrade PRs result in CODEOWNER pings, we should repeat this pattern.