Add o11y settings ui

What does this MR do and why?

This adds the UI for the o11y service settings page. This will be used to configure the o11y service for a group. These settings can be seen in use in !197536 (merged)

References

UI for O11y settings Add a UI for updating the connection settings to the o11y service.

There are three MRs related to this issue:

1. !198194 (merged)
2. !198201 (merged) <- you are here
3. !198221 (merged) <- full functionality here

Screenshots or screen recordings

How to set up and validate locally

1. In console enable the feature flag for your user:

Feature.enable(:o11y_settings_access, User.first) # Or whatever user you are using

3. Go to: http://localhost:3000/groups/toolbox/-/observability/o11y_service_settings/edit and edit the settings

MR acceptance checklist

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