refactor(files): Remove App class and move files.max_chunk_size to JSConfigHelper #18666

Job	Run time
changes	4s
integration-sqlite (capabilities_features, 8.1, main)	1m 58s
integration-sqlite (collaboration_features, 8.1, main)	2m 31s
integration-sqlite (comments_features, 8.1, main)	2m 22s
integration-sqlite (dav_features, 8.1, main)	6m 15s
integration-sqlite (features, 8.1, main)	8m 25s
integration-sqlite (federation_features, 8.1, main)	4m 26s
integration-sqlite (--tags ~@large files_features, 8.1, main)	11m 12s
integration-sqlite (filesdrop_features, 8.1, main)	2m 2s
integration-sqlite (file_conversions, 8.1, main)	2m 0s
integration-sqlite (openldap_features, 8.1, main)	1m 27s
integration-sqlite (openldap_numerical_features, 8.1, main)	1m 45s
integration-sqlite (ldap_features, 8.1, main)	2m 21s
integration-sqlite (remoteapi_features, 8.1, main)	1m 24s
integration-sqlite (setup_features, 8.1, main)	1m 1s
integration-sqlite (sharees_features, 8.1, main)	3m 40s
integration-sqlite (sharing_features, 8.1, main)	14m 38s
integration-sqlite (videoverification_features, 8.1, main)	3m 52s
integration-sqlite-summary	4s
	1h 11m 27s

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