Issue #3437783 by mfb, pradhumanjain2311: Use standardized SPDX license identifiers

core/core.libraries.yml

core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php

core/package.json

.../FunctionalJavascript/AssetAggregationAcrossPagesTest.php

...lJavascript/OpenTelemetryAuthenticatedPerformanceTest.php

...ionalJavascript/OpenTelemetryFrontPagePerformanceTest.php

...ests/src/FunctionalJavascript/StandardPerformanceTest.php

...l/Tests/Core/Asset/CssCollectionOptimizerLazyUnitTest.php

...ts/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php

..._files/css_input_with_import.css.optimized.aggregated.css

...t/css_test_files/css_license.css.optimized.aggregated.css