Consistent positioning of Timepicker in SearchBar

[lizozom]

Summary

Align SearchBar \ Time picker to the right
Resolves #41900

In apps where SearchBar only contains Timepicker, it looks like this:

Checklist

Use strikethroughs to remove checklist items you don't feel are applicable to this PR.

• This was checked for cross-browser compatibility, including a check against IE11
• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• This was checked for keyboard-only and screenreader accessibility

For maintainers

• This was checked for breaking API changes and was labeled appropriately
• This includes a feature addition or change that requires a release note and was labeled appropriately

[elasticmachine]

Pinging @elastic/kibana-app-arch

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request

[cchaos]

There's actually no need to add a custom style for this. The .kbnQueryBar is an EuiFlexGroup component which accepts justifyContent="flexEnd".

[AlonaNadler]

I checked and played with the PR LGTM, thanks @lizozom

[lizozom]

@cchaos done

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request

[ryankeairns]

LGTM. Reviewed the change requested by Caroline (who is out) and it looks good.

Fixed and reviewed by @ryan