Remove canonical URLs from demo metadata #7470

Job	Run time
set_build_params	2s
validate_metadata / generate-metadata-file-list	8s
validate_metadata / validate-metadata-preview-images	0s
validate_metadata / validate-metadata-schema	25s
build / validate-poetry-lock-file	21s
build / compute-build-strategy-matrix	2m 27s
build / validate-inputs	1s
build / build-branch (0)	41m 29s
build / build-branch (1)	34m 9s
build / build-branch (2)	34m 0s
build / build-branch (3)	33m 23s
build / build-branch (4)	33m 37s
build / build-branch (5)	36m 44s
build / build-branch (6)	34m 10s
build / build-branch (7)	34m 9s
build / build-branch (8)	34m 4s
build / build-branch (9)	34m 8s
build / aggregate_build	0s
save-build-context	2s
	5h 53m 19s

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