config: Remove level field in console/file loggers

[vadmeste]

Description

Also rename fileName field in file logger to filename

Motivation and Context

Fixes #3927

How Has This Been Tested?

go test + Manually

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-io]

Codecov Report

Merging #3938 into master will decrease coverage by 0.1%.
The diff coverage is 60.5%.

@@            Coverage Diff            @@
##           master   #3938      +/-   ##
=========================================
- Coverage    68.5%   68.4%   -0.11%     
=========================================
  Files         173     173              
  Lines       23315   23391      +76     
=========================================
+ Hits        15973   16000      +27     
- Misses       6299    6329      +30     
- Partials     1043    1062      +19

Impacted Files	Coverage Δ
cmd/gateway-main.go	0% <0%> (ø)	⬆️
cmd/logger-console-hook.go	78.57% <100%> (-8.39%)	⬇️
cmd/config-migrate.go	60.1% <54.34%> (-0.89%)	⬇️
cmd/logger-file-hook.go	27.9% <83.33%> (+2.9%)	⬆️
cmd/config-v16.go	85.36% <88.88%> (ø)
cmd/logger.go	77.5% <0%> (-3.75%)	⬇️
cmd/fs-v1-rwpool.go	58.91% <0%> (-2.33%)	⬇️
cmd/fs-v1-background-append.go	78.52% <0%> (-1.35%)	⬇️
cmd/posix.go	73.25% <0%> (-0.16%)	⬇️

---

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[harshavardhana]

@balamurugana need your reviews here..

[krishnasrinivas]

@vadmeste this has conflicts

[vadmeste]

@vadmeste this has conflicts

Conflict resolved @krishnasrinivas

[harshavardhana]

@vadmeste can you resolve the conflict?

[vadmeste]

@vadmeste can you resolve the conflict?

Done