Spaces app doesn't set its doc title

[cjcenizal]

Extracted from #69286. When the Spaces app mounts, it needs to call chrome.docTitle.change(PLUGIN_NAME);. When it unmounts, it needs to call chrome.docTitle.reset();. See #71045 for examples.

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)

[legrego]

Thanks for opening this, CJ! We're happy to take this on, but it almost feels like something the Management app should handle automatically for each of the registered "sub-apps". @mattkime what are your thoughts, does that sound feasible/reasonable?

I expect that some of the more complex apps would want to be able to control their own titles, but I would think that we can/should provide a reasonable default experience to reduce boilerplate in each of the sub-apps.