Save plugin preferences with expected static key #1254

Job	Run time
Install	22s
Build Tests	58s
Lint	52s
Floating Deps Test	1m 29s
Default Tests	1m 56s
Typecheck Docs	1m 3s
[email protected]	1m 55s
[email protected]	1m 15s
Publish Docs to Cloudflare Pages	6h 0m 14s
[email protected]	1m 29s
ember-lts-3.28	1m 24s
ember-4.0	1m 13s
ember-lts-4.4	1m 26s
ember-lts-4.8	1m 45s
ember-lts-4.12	1m 38s
ember-release	1m 27s
ember-beta	1m 17s
ember-canary	1m 22s
'ember-release + embroider-safe'	1m 19s
'ember-release + embroider-optimized'	5m 14s
'ember-lts-3.28 + embroider-optimized'	5m 20s
'ember-lts-4.4 + embroider-optimized'	5m 13s
'ember-lts-4.8 + embroider-optimized'	5m 13s
Release	0s
Post Preview URL as comment to PR	0s
	6h 45m 24s

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