Add tests for trailing commas after parameters and arguments #1656

Job	Run time
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	5m 8s
JS API \| Pure JS \| Browser	0s
JS API \| Embedded \| Node lts/* \| windows-latest	7m 23s
Lint spec files	14s
JS API \| Embedded \| Node lts/* \| macos-latest	5m 11s
Static analysis	20s
JS API \| Embedded \| Node lts/-1 \| ubuntu-latest	5m 6s
Unit tests	35s
JS API \| Embedded \| Node lts/-2 \| ubuntu-latest	5m 1s
JS API \| Embedded \| Node lts/-3 \| ubuntu-latest	5m 7s
	34m 5s

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