fix(katana-provider): fix how latest block number/hash is retrieved from db

[kariy]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (df68436) 69.40% compared to head (6da3bb4) 69.44%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
crates/katana/core/src/service/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1475      +/-   ##
==========================================
+ Coverage   69.40%   69.44%   +0.04%     
==========================================
  Files         228      228              
  Lines       22138    22138              
==========================================
+ Hits        15364    15373       +9     
+ Misses       6774     6765       -9     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[tarrencev]

Can we add a quick test for this? Generally, it's a good practice to write tests for regressions

[kariy]

Can we add a quick test for this? Generally, it's a good practice to write tests for regressions

Added some asserts in the provider tests.

The Error: Missing block header for block number 0 bug seems to be caused by this issue and also #1477.