Move some unmarshaling errors to the Validate method

[mx-psi]

Description:

• Move some errors happening during unmarshaling to the new Validate method.

Link to tracking Issue: #2867 (comment)

To be tracked on #2819

[codecov]

Codecov Report

Merging #2929 (f705d9b) into main (fa73baf) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##             main    #2929   +/-   ##
=======================================
  Coverage   91.66%   91.67%           
=======================================
  Files         312      312           
  Lines       15330    15334    +4     
=======================================
+ Hits        14053    14058    +5     
  Misses        870      870           
+ Partials      407      406    -1     

Impacted Files	Coverage Δ
receiver/prometheusreceiver/config.go	66.66% <0.00%> (ø)
receiver/hostmetricsreceiver/config.go	58.33% <50.00%> (-5.31%)	⬇️
receiver/jaegerreceiver/config.go	100.00% <100.00%> (+8.82%)	⬆️
receiver/otlpreceiver/config.go	100.00% <100.00%> (ø)

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