overlord: type SnapSetup and SnapState to return naming.InstanceName and naming.SnapName

[maykathm]

Requires #17496 (first commit is from that PR and can be ignored)

[github-actions]

Mon Aug 24 15:04:58 UTC 2026

Spread tests skipped

[codecov]

Codecov Report

❌ Patch coverage is 82.56659% with 72 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.89%. Comparing base (f12eaba) to head (97ec40b).

Files with missing lines	Patch %	Lines
overlord/snapstate/handlers.go	69.37%	16 Missing and 33 partials ⚠️
overlord/ifacestate/handlers.go	85.18%	0 Missing and 4 partials ⚠️
overlord/snapstate/autorefresh.go	81.25%	1 Missing and 2 partials ⚠️
overlord/snapstate/snap.go	93.75%	1 Missing and 2 partials ⚠️
overlord/snapstate/snapstate.go	94.54%	0 Missing and 3 partials ⚠️
overlord/snapstate/handlers_components.go	86.66%	0 Missing and 2 partials ⚠️
overlord/devicestate/handlers_gadget.go	75.00%	0 Missing and 1 partial ⚠️
overlord/ifacestate/helpers.go	66.66%	0 Missing and 1 partial ⚠️
overlord/ifacestate/ifacestate.go	66.66%	0 Missing and 1 partial ⚠️
overlord/servicestate/quota_handlers.go	50.00%	0 Missing and 1 partial ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #17519      +/-   ##
==========================================
+ Coverage   78.83%   78.89%   +0.05%     
==========================================
  Files        1409     1400       -9     
  Lines      198150   198130      -20     
  Branches     2502     2502              
==========================================
+ Hits       156218   156320     +102     
+ Misses      32553    32419     -134     
- Partials     9379     9391      +12     

Flag	Coverage Δ
unittests	78.89% <82.56%> (+0.05%)	⬆️

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