Save plugin preferences with expected static key #1252

Job	Run time
Install	1m 10s
Build Tests	55s
Lint	47s
Typecheck Docs	1m 25s
Default Tests	1m 7s
Floating Deps Test	1m 12s
Publish Docs to Cloudflare Pages	32m 53s
[email protected]	1m 27s
[email protected]	1m 36s
[email protected]	1m 4s
ember-lts-3.28	1m 22s
ember-4.0	1m 17s
ember-lts-4.4	1m 24s
ember-lts-4.8	1m 33s
ember-lts-4.12	1m 54s
ember-release	1m 24s
ember-beta	1m 22s
ember-canary	2m 24s
'ember-release + embroider-safe'	5m 15s
'ember-release + embroider-optimized'	5m 14s
'ember-lts-3.28 + embroider-optimized'	5m 17s
'ember-lts-4.4 + embroider-optimized'	5m 13s
'ember-lts-4.8 + embroider-optimized'	5m 15s
Release	0s
Post Preview URL as comment to PR	1s
	1h 22m 31s

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