Remove config unmarshaler interface, per deprecation comment

[bogdandrutu]

Signed-off-by: Bogdan Drutu [email protected]

[codecov]

Codecov Report

Merging #5348 (709148a) into main (df91fce) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5348      +/-   ##
==========================================
+ Coverage   90.60%   90.61%   +0.01%     
==========================================
  Files         190      190              
  Lines       11429    11423       -6     
==========================================
- Hits        10355    10351       -4     
+ Misses        853      852       -1     
+ Partials      221      220       -1     

Impacted Files	Coverage Δ
service/config_provider.go	90.32% <100.00%> (+14.64%)	⬆️
...e/internal/configunmarshaler/defaultunmarshaler.go	100.00% <100.00%> (ø)
service/servicetest/configprovider.go	76.92% <100.00%> (ø)
pdata/internal/common.go	91.82% <0.00%> (-0.75%)	⬇️

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