fix(core-transaction-pool): only return error when min fee is too low for broadcast and accept

[spkjp]

Proposed changes

All a client needs to know is wether it's transaction got accepted (either accepted and/or broadcasted by a node). In which case there's no need to return an error unless neither is the case.

Resolves #1937

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improve a current implementation without adding a new feature or fixing a bug)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Build (changes that affect the build system)
• Docs (documentation only changes)
• Test (adding missing tests or fixing existing tests)
• Other... Please describe:

Checklist

• I have read the CONTRIBUTING documentation
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[codecov-io]

Codecov Report

Merging #1940 into develop will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1940      +/-   ##
===========================================
+ Coverage     40.4%   40.41%   +0.01%     
===========================================
  Files          350      350              
  Lines         7626     7624       -2     
  Branches      1144     1109      -35     
===========================================
  Hits          3081     3081              
  Misses        4530     4530              
+ Partials        15       13       -2

Impacted Files	Coverage Δ
packages/core-transaction-pool/src/guard.ts	89.69% <ø> (+1.81%)	⬆️
packages/core-logger-winston/src/formatter.ts	38.88% <0%> (ø)	⬆️
packages/core-test-utils/src/generators/wallets.ts	14.28% <0%> (ø)	⬆️

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