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Description of problem:
Anaconda boot arguments without the "inst." prefix have been deprecated since RHEL-7. Remove the support in RHEL-9.

Version-Release number of selected component (if applicable):
anaconda-34.24.6-1.el9

How reproducible:
Always

Steps to Reproduce:
1. Start the installation with an anaconda boot argument without the "inst." prefix, for example "text"

Actual results:
The boot argument is recognized and used.

Expected results:
Anaconda boot arguments without the "inst." prefix are not used any more.

https://github.com/rhinstaller/anaconda/pull/3328

(In reply to Radek Vykydal from comment #4)
> Release engineering / compose tooling is not ready for the change yet.

so revert it temporarily
https://github.com/rhinstaller/anaconda/pull/3346

PR: https://github.com/rhinstaller/anaconda/pull/3422

warnings are written before start of installer and into anaconda.log; for example:
WRN stdout: Kernel boot argument 'repo' detected. Did you want to use 'inst.repo' for the installer instead?
WRN stdout: All Anaconda kernel boot arguments are now required to use 'inst.' prefix!

and then the deprecated boot arguments are ignored, and interactive installer starts.
tested ks, repo, sshd, text arguments using anaconda-34.25.0.9-1.el9 (compose RHEL-9.0.0-20210712.3)