[Uptime] TLS status alerts - use date format defined in Kibana UI settings for action message content

[dominiqueclarke]

Kibana version:
8.x

Elasticsearch version:
8.x

Server OS version:
macOS

Browser version:
Chrome 90.x

Browser OS version:
macOS

Original install method (e.g. download page, yum, from source, etc.):
from source

Describe the enhancement:
The date format schema in the TLS certificate status alert is currently hardcoded. It would be ideal to map this to the date format defined UI settings.

This date format setting can be fetched from the UISettingsService.

Looking into it, it appears as if the UISettings service is available server-side on CoreStart. Unfortunately, server-side rule types are initialized on setup, rather than start. Using this service within the rule types will require waiting for CoreStart to be available in setup. This change will actually be implemented within #100699, making onboarding UISettings with the server-side rule types more straightforward.

[elasticmachine]

Pinging @elastic/uptime (Team:uptime)

[paulb-elastic]

Linking to #91392