bgpd: "Per peer-group graceful-restart configuration is not yet supported"

[c-po]

Description

In FRR 9.1 and 10.1 it was possible to define graceful-restart-disable on a peer group.
Now with 10.2 on the road it throws an error on a previously working feature.

I do not know if this is intended or not, but it breaks existing configurations.

Version

FRR stable/10.2 commit c9975e1

How to reproduce

!
router bgp 100
  neighbor foo peer-group
  neighbor foo graceful-restart-disable
!

Throws: Per peer-group graceful-restart configuration is not yet supported

Expected behavior

CLI command should work as in 10.1 and 9.1

Actual behavior

Can not set previously working CLI command

Additional context

No response

Checklist

• I have searched the open issues for this bug.
• I have not included sensitive information in this report.

[ton31337]

@c-po could you test this branch https://github.com/FRRouting/frr/compare/master...opensourcerouting:frr:fix/gr_peer-groups?expand=1? If all good, I will create a topotest and push this PR.