Add tests for comments in more expression-like contexts #1525

Job	Run time
JS API \| Pure JS \| Browser	0s
Language \| Dart Sass \| Dart ${{ matrix.dart_channel }}	0s
JS API \| Pure JS \| Node ${{ matrix.node_version }} \| ${{ matrix.os }}	0s
JS API \| Embedded \| Node lts/* \| ubuntu-latest	4m 42s
JS API \| Embedded \| Node lts/* \| windows-latest	7m 12s
Lint spec files	17s
JS API \| Embedded \| Node lts/* \| macos-latest	3m 40s
Static analysis	17s
Unit tests	43s
JS API \| Embedded \| Node lts/-1 \| ubuntu-latest	4m 44s
JS API \| Embedded \| Node lts/-2 \| ubuntu-latest	5m 15s
JS API \| Embedded \| Node lts/-3 \| ubuntu-latest	5m 16s
	32m 6s

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