chore(sourcemaps): Remove `sourcemaps explain` #5297

Job	Run time
Test Node / Prepare Build	1s
Test / Windows	1s
Lint / macOS – aarch64	1s
Run Danger Checks	1s
Test / macOS – x86_64	1s
Test Node / Type Check	1s
Test Swift / Run tests	1s
Test / Linux	1s
Lint / macOS – x86_64	1s
Test / macOS – aarch64	1s
Lint / Linux	1s
Lint / Windows	1s
Check required jobs	3s
Test Node / Test Node ${{ matrix.node-version }}	1s
	16s

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