[pdata] Remove deprecated primitive slice getters/setters

[dmitryax]

This is the second step in a sequence of backward changes to replace primitive slices with immutable structs #5263

[codecov]

Codecov Report

Merging #5347 (f55204c) into main (ab79681) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5347      +/-   ##
==========================================
+ Coverage   90.75%   90.97%   +0.22%     
==========================================
  Files         190      190              
  Lines       11422    11392      -30     
==========================================
- Hits        10366    10364       -2     
+ Misses        837      809      -28     
  Partials      219      219              

Impacted Files	Coverage Δ
pdata/internal/metrics.go	92.50% <ø> (+8.40%)	⬆️
pdata/internal/common.go	95.38% <100.00%> (+2.81%)	⬆️

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[bogdandrutu]

We probably need to coordinate with @dashpole since most likely Google exporter uses these fields.

[dmitryax]

Yes, a few other distros are using it as well. They should migrate to the methods prefixed with M by the next release according to the schedule defined #5263 . Let me know if that schedule makes sense

[dmitryax]

@bogdandrutu the contrib test is passing now