[FRR] Set FD limit to avoid warning log

[dgsudharsan]

Description

After loading FRR 10.0.1 the below message is seen. This needs to be fixed

vtysh

Hello, this is FRRouting (version 10.0.1).
Copyright 1996-2005 Kunihiro Ishiguro, et al.

2024/12/06 21:42:31 [YDG3W-JND95] FD Limit set: 1048576 is stupidly large.  Is this what you intended?  Consider using --limit-fds also limiting size to 100000

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[dgsudharsan]

@sudhanshukumar22 @hasan-brcm please refer to the conversation in FRRouting/frr#16516

[sudhanshukumar22]

I have pushed #21210 for this issue.