[uiSettings/theme/version] override label to aid KBN_OPTIMIZER_THEMES discovery

[spalger]

In #94834 we removed the other options from the uiSetting when the KBN_OPTIMIZER_THEME environment variable isn't set, which is a little confusing and doesn't really help people know what to do when they need to test v7. This change overrides the label for the option when only one option is available so that people will be reminded to use the KBN_OPTIMIZER_THEMES environment variable in order to get additional options.

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)

[spalger]

cc @cchaos

[cchaos]

😄 Thanks @spalger ! Any way to put that text as the helpText of the EuiFormRow, then we could even just disable the whole input if there's less than 2 options???? Perhaps, maybe?

[spalger]

I tried using the readonly flag to disable the select box and moving the text to the description but doing that actually hides the setting from the advanced settings page, so I think that's more confusing. I also think the help text is useful but a lot less obvious than putting the hint right into the value. For this dev only feature I think it makes sense to save people time by going with the ugly but effective approach personally.

[cchaos]

Ha, yeah. I was just thinking that you can't easily highlight the text of a select option for a dev to easily copy/paste. I'm pushing you a commit that then moves the message to the description and simplifies the option label.

[TinaHeiligers]

LGTM

[spalger]

@elasticmachine merge upstream

[kibanamachine]

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