Cannot start k3s with authorization-config apiserver flag set

[brandond]

Environmental Info:
K3s Version:
v1.32.x

Node(s) CPU architecture, OS, and Version:
n/a

Cluster Configuration:
n/a

Describe the bug:
Cannot set --authorization-config apiserver arg due to hardcoded --authorization-mode flag

Steps To Reproduce:

1. Start k3s with --kube-apiserver-arg=authorization-config=/path/to/config
2. Note that apiserver exits with error as authorization-mode and authorization-config flag cannot both be set, and authorization-mode flag cannot be removed from default args.

Expected behavior:
No conflicting flags

Actual behavior:
conflicting flags:

ERRO[0000] apiserver exited: --authorization-config can not be specified when --authorization-mode or --authorization-webhook-* flags are defined

Additional context / logs:

• Internal ref: SURE-9991