update string in isBuildKitImagePolicyError #2960

Job	Run time
CLI	39s
OCI Implementation Registry Compatibility	1m 21s
Tests Matrix (src/test/container-features/containerFeaturesOrder.test.ts)	46s
Tests Matrix (src/test/container-features/e2e.test.ts)	3m 29s
Tests Matrix (src/test/container-features/featuresCLICommands.test.ts)	3m 18s
Tests Matrix (src/test/cli.build.test.ts)	4m 31s
Tests Matrix (src/test/cli.exec.buildKit.1.test.ts)	4m 57s
Tests Matrix (src/test/cli.exec.buildKit.2.test.ts)	6m 14s
Tests Matrix (src/test/cli.exec.nonBuildKit.1.test.ts)	4m 52s
Tests Matrix (src/test/cli.exec.nonBuildKit.2.test.ts)	5m 9s
Tests Matrix (src/test/cli.test.ts)	51s
Tests Matrix (src/test/cli.up.test.ts)	4m 13s
Tests Matrix (src/test/imageMetadata.test.ts)	5m 41s
Tests Matrix (src/test/container-features/containerFeaturesOCIPush.test.ts)	49s
Tests Matrix (--exclude src/test/container-features/containerFeaturesOrder.test.ts --exclude src/...	7m 29s
Tests	0s
	54m 19s

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