Add tests for the deprecations API (#1967) #1405

Job	Run time
Language \| Dart Sass \| Dart stable	57s
JS API \| Embedded \| Node lts/* \| ubuntu-latest	4m 33s
Language \| Dart Sass \| Dart dev	1m 4s
JS API \| Pure JS \| Node lts/* \| ubuntu-latest	1m 17s
JS API \| Embedded \| Node lts/* \| windows-latest	7m 19s
JS API \| Pure JS \| Browser	1m 48s
JS API \| Pure JS \| Node lts/* \| windows-latest	3m 43s
JS API \| Embedded \| Node lts/* \| macos-latest	9m 19s
JS API \| Pure JS \| Node lts/* \| macos-latest	3m 37s
JS API \| Embedded \| Node lts/-1 \| ubuntu-latest	4m 56s
Lint spec files	23s
JS API \| Pure JS \| Node lts/-1 \| ubuntu-latest	1m 24s
JS API \| Embedded \| Node lts/-2 \| ubuntu-latest	5m 6s
Static analysis	22s
JS API \| Pure JS \| Node lts/-2 \| ubuntu-latest	1m 15s
JS API \| Embedded \| Node lts/-3 \| ubuntu-latest	4m 59s
Unit tests	37s
JS API \| Pure JS \| Node lts/-3 \| ubuntu-latest	1m 25s
	54m 4s

Provide feedback