status: Use prepare_for_write instead of require_root

[ckyrouac]

This prevents /sysroot from switching to being
persistently mounted as rw.

[cgwalters]

I'm a bit confused since the link for "
Integration Test / integration (x86_64, rhel-9-5) (pull_request_target) Failing after 49m " to testing farm takes me to something for Fedora 40?

[cgwalters]

Ah, at least it looks like the integration tests are incorrectly testing for this behavior:

TASK [assert] ******************************************************************
fatal: [guest]: FAILED! => changed=false 
  assertion: result_sysroot_mount_status.stdout == "rw"
  evaluated_to: false
  msg: /sysroot is not mounted with rw permission

[cgwalters]

Not sure why the install tests suddenly started falling over with ENOSPC...trying to debug