fix: use yaml.v2 as yaml parser

[foxspy]

issue: #34298
Viper uses yaml.v2 as the parser. This PR will adopt the parsing logic from Viper to handle YAML files, ensuring maximum consistency in parsing.

[foxspy]

/hold
wait #37418 merged

[codecov]

Codecov Report

Attention: Patch coverage is 47.22222% with 19 lines in your changes missing coverage. Please review.

Project coverage is 80.55%. Comparing base (bc9562f) to head (a9c78a5).
Report is 25 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/config/config.go	43.33%	16 Missing and 1 partial ⚠️
pkg/config/file_source.go	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #37423      +/-   ##
==========================================
- Coverage   82.50%   80.55%   -1.95%     
==========================================
  Files        1064     1354     +290     
  Lines      163530   188907   +25377     
==========================================
+ Hits       134917   152177   +17260     
- Misses      23268    31379    +8111     
- Partials     5345     5351       +6     

Components	Coverage Δ
Client	60.27% <ø> (ø)
Core	68.13% <ø> (∅)
Go	83.21% <47.22%> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
pkg/config/file_source.go	77.89% <66.66%> (+0.75%)	⬆️
pkg/config/config.go	68.65% <43.33%> (-11.35%)	⬇️

... and 313 files with indirect coverage changes

[mergify]

@foxspy E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[foxspy]

/unhold

[mergify]

@foxspy go-sdk check failed, comment rerun go-sdk can trigger the job again.

[mergify]

@foxspy E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[foxspy]

rerun go-sdk

[foxspy]

/run-cpu-e2e

[mergify]

@foxspy cpp-unit-test check failed, comment rerun cpp-unit-test can trigger the job again.

[mergify]

@foxspy E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[foxspy]

/run-cpu-e2e

[mergify]

@foxspy E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[foxspy]

/run-cpu-e2e

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, foxspy

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