chore(vscode): move TypeScript settings to their js/ts.* replacements

[jong-kyung]

Summary

VS Code deprecated the typescript.* keys for settings shared between JavaScript and TypeScript in favour of the js/ts.* namespace. The four such keys in .vscode/settings.json still show a deprecation notice in the settings editor.

-  "typescript.preferences.importModuleSpecifierEnding": "js",
-  "typescript.reportStyleChecksAsWarnings": false,
-  "typescript.updateImportsOnFileMove.enabled": "always",
-  "typescript.experimental.useTsgo": true,
+  "js/ts.preferences.importModuleSpecifierEnding": "js",
+  "js/ts.reportStyleChecksAsWarnings": false,
+  "js/ts.updateImportsOnFileMove.enabled": "always",
+  "js/ts.experimental.useTsgo": true,

Same settings, current names — behaviour is unchanged. The [typescript] / [typescriptreact] formatter blocks are a different mechanism and are not affected.

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