Revert "[openshift-4.16] [ART-9923] set dockerfile_fallback"

[ashwindasr]

Reverts #5035

Fallback not needed, since we are aiming only for 4.17 now

[openshift-bot]

Validating 1 file(s)...
Traceback (most recent call last):
File "/usr/local/bin/validate-ocp-build-data", line 33, in
sys.exit(load_entry_point('rh-ocp-build-data-validator==0.2.5', 'console_scripts', 'validate-ocp-build-data')())
File "/usr/local/lib/python3.9/site-packages/validator/main.py", line 87, in main
validate(f, args.exclude_vpn, args.schema_only)
File "/usr/local/lib/python3.9/site-packages/validator/main.py", line 11, in validate
(parsed, err) = format.validate(open(file).read())
FileNotFoundError: [Errno 2] No such file or directory: 'images/ose-azure-workload-identity-webhook.yml'

[openshift-ci]

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