SR Linux SNMP changes for 24.3

[hellt]

YANG model for SNMP changes in 24.3.
This PR adjusts the config accordingly and makes it version-dependent.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6fd6047) 51.75% compared to head (5a6bd61) 51.83%.
Report is 10 commits behind head on main.

❗ Current head 5a6bd61 differs from pull request most recent head a39ed51. Consider uploading reports for the commit a39ed51 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1845      +/-   ##
==========================================
+ Coverage   51.75%   51.83%   +0.07%     
==========================================
  Files         148      149       +1     
  Lines       14548    14552       +4     
==========================================
+ Hits         7530     7543      +13     
+ Misses       6183     6176       -7     
+ Partials      835      833       -2     

Files	Coverage Δ
nodes/srl/srl.go	57.45% <100.00%> (-0.82%)	⬇️
nodes/srl/version_specific.go	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes