Added IP address validation in node address update

[stav-bentov]

Prevent Updating Node Address with Invalid IP

• Added a check to ensure that the node address is not updated if a valid IP address cannot be obtained.
• This enhancement addresses potential issues where invalid IP addresses (i.e., empty strings or "?" placeholders) could be used to update node address.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.99%. Comparing base (9071a5c) to head (bd55493).
Report is 9 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1633      +/-   ##
============================================
+ Coverage     70.85%   70.99%   +0.13%     
============================================
  Files           121      121              
  Lines         65169    65175       +6     
============================================
+ Hits          46176    46269      +93     
+ Misses        18993    18906      -87     

Files with missing lines	Coverage Δ
src/cluster_legacy.c	87.20% <100.00%> (+<0.01%)	⬆️

... and 18 files with indirect coverage changes