Handle external-state plugin errors with ErrorController

[KVSRoyal]

Now that ErrorController is available, we use that to handle errors from the external-state plugin instead of letting it fall through. See included docs updates for more details.

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• minor
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• N/A. Part of 1.0

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[codecov]

Bundle Report

Changes will increase total bundle size by 375.17kB (7.83%) ⬆️⚠️, exceeding the configured threshold of 5%.

Bundle name	Size	Change
plugins/asset-transform/core	7.91kB	-3.34kB (-29.69%) ⬇️
plugins/external-state/core	426.16kB	378.51kB (794.3%) ⬆️⚠️

Affected Assets, Files, and Routes:

view changes for bundle: plugins/asset-transform/core

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
index.legacy-esm.js	-3.34kB	0 bytes	-100.0%

view changes for bundle: plugins/external-state/core

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
ExternalStatePlugin.native.js	373.76kB	408.09kB	1088.77% ⚠️
cjs/index.cjs	1.62kB	6.78kB	31.46% ⚠️
index.legacy-esm.js	1.56kB	5.64kB	38.22% ⚠️
index.mjs	1.56kB	5.64kB	38.22% ⚠️

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (d09c972) to head (dbf4003).

Additional details and impacted files

@@           Coverage Diff            @@
##   player-1-dot-zero   #868   +/-   ##
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