Add tests for trailing commas after parameters and arguments #1657

Job	Run time
JS API \| Pure JS \| Node ${{ matrix.node_version }} \| ${{ matrix.os }}	0s
Language \| Dart Sass \| Dart ${{ matrix.dart_channel }}	0s
JS API \| Embedded \| Node lts/* \| ubuntu-latest	5m 1s
JS API \| Embedded \| Node lts/* \| windows-latest	6m 46s
JS API \| Pure JS \| Browser	0s
Lint spec files	18s
JS API \| Embedded \| Node lts/* \| macos-latest	3m 45s
Static analysis	23s
JS API \| Embedded \| Node lts/-1 \| ubuntu-latest	4m 49s
Unit tests	41s
JS API \| Embedded \| Node lts/-2 \| ubuntu-latest	4m 59s
JS API \| Embedded \| Node lts/-3 \| ubuntu-latest	5m 11s
	31m 53s

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