chore: fix log message formatting

[kylezs]

Annoying seeing the \n\t\t in some log messages like this:

{"timestamp":"2024-01-03T10:51:08.061388Z","level":"ERROR","fields":{"message":"Failed to connect to Polkadot node at https://polkadot.api.onfinality.io:443/rpc?apikey=2cc**** with error: Rpc error: RPC error: Networking or low-level protocol error: Server returned an error status code: 504. Please check your CFE\n\t\t\t\t\t\tconfiguration file. Retrying in 10s..."},"target":"chainflip_engine::dot::http_rpc"}

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (e8aa08c) 71% compared to head (6f52804) 71%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
engine/src/eth/rpc.rs	0%	6 Missing ⚠️
engine/src/btc/rpc.rs	0%	4 Missing ⚠️
engine/src/dot/http_rpc.rs	0%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4380   +/-   ##
=====================================
  Coverage     71%     71%           
=====================================
  Files        394     394           
  Lines      66829   66892   +63     
  Branches   66829   66892   +63     
=====================================
+ Hits       47703   47770   +67     
+ Misses     16693   16689    -4     
  Partials    2433    2433           

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