fix(log): Limit RPC failure log length, add details to RPC failure logs

[teor2345]

Motivation

Zebra will log all the data sent by an RPC on failure, including up to 2MB of block or transaction data.

I also improved some specific RPC failure and RPC test logs as part of this PR.

Solution

• Log up to 100 characters of RPC data when an RPC fails
• When a submitblock RPC fails, log the specific kind of failure, and log the block hash

Related fixes:

• Add detailed logs to some RPC tests, to help diagnose test failures

Review

This is a low priority usability fix, it also reduces log size on disk.

Reviewer Checklist

• Will the PR name make sense to users?
  • Does it need extra CHANGELOG info? (new features, breaking changes, large changes)
• Are the PR labels correct?
• Does the code do what the ticket and PR says?
  • Does it change concurrent code, unsafe code, or consensus rules?
• How do you know it works? Does it have tests?

[codecov]

Codecov Report

Merging #6754 (b604aa6) into main (3706ff6) will increase coverage by 0.02%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6754      +/-   ##
==========================================
+ Coverage   78.11%   78.14%   +0.02%     
==========================================
  Files         308      308              
  Lines       40877    40887      +10     
==========================================
+ Hits        31931    31951      +20     
+ Misses       8946     8936      -10