Skip repeat editor capability fetches in MySiteViewModel

[jkmassel]

Description

Follow-up to #22785 (review feedback from @nbradbury). The capability fetch in MySiteViewModel.onResume() (apiRoot + themes?status=active) was firing on every return to the My Site tab — combined with the launch in refresh(), the same two requests could fire twice in close succession (e.g. resume after pull-to-refresh).

Editor capabilities rarely change, so we now dedup with an in-memory set keyed by site.id, populated when fetchEditorCapabilitiesWithSnackbar is first attempted for a site this ViewModel session. Subsequent non-user-initiated calls return early. User-initiated paths (pull-to-refresh, refresh(isPullToRefresh = true)) bypass the gate so the user can always force a fresh fetch.

Per-session caching is sufficient — no TTL or persistent storage needed. The next ViewModel session will refetch.

Testing instructions

Covered by four new unit tests in MySiteViewModelTest:

• Two onResume() calls → 1 fetch
• onResume() + non-PTR refresh() → 1 fetch
• onResume() + PTR refresh(true) → 2 fetches
• PTR refresh(true) + onResume() → 1 fetch

Manual verification:

1. Open the app and navigate to the My Site tab on a site with cached capabilities.
2. Navigate away to another tab and back to My Site.

• Verify no apiRoot or themes?status=active requests fire in logcat on the return.

3. Pull-to-refresh the My Site tab.

• Verify both requests fire on the PTR.

4. Switch the selected site, then return to My Site.

• Verify capabilities are fetched for the newly-selected site (different site.id).

Related issues

Follow-up to #22785 — addresses one of the two follow-ups agreed in review.

[dangermattic]

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	Build Number	1488
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	Commit	5d99212
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	App Name	Jetpack Android
	Build Type	Debug
	Version	pr22833-5d99212
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	Commit	5d99212
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.21%. Comparing base (57acb95) to head (5d99212).

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #22833   +/-   ##
=======================================
  Coverage   37.20%   37.21%           
=======================================
  Files        2317     2317           
  Lines      124509   124513    +4     
  Branches    16907    16909    +2     
=======================================
+ Hits        46324    46336   +12     
+ Misses      74438    74432    -6     
+ Partials     3747     3745    -2     

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