Bug/is 902 zero snapshot

[olehnikolaiev]

fixes https://github.com/skalenetwork/internal-support/issues/902

snapshot for block 0 should be always available for downloading

tested in skale-node-tests

[github-actions]

SUGGESTIONS BEFORE MERGE:

1. Build custom container here: https://github.com/skalenetwork/skaled/actions?query=workflow%3A%22Custom+Docker+and+Binary%22
2. Test it here: https://github.com/skalenetwork/skale-ci-integration_tests/actions?query=workflow%3A%22Skaled+Nightly+Tests%22
3. Edit VERSION file appropriately to your changes!
   See https://skalelabs.atlassian.net/wiki/spaces/SKALE/pages/2444951553/Branching+instructions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fce0fd1) 45.75% compared to head (484421e) 46.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           v3.18.0    #1790      +/-   ##
===========================================
+ Coverage    45.75%   46.00%   +0.25%     
===========================================
  Files          358      358              
  Lines        51878    51878              
===========================================
+ Hits         23737    23867     +130     
+ Misses       28141    28011     -130