Deprecate Profiles.ProfilesDictionary in favor of Profiles.Dictionary.

[bogdandrutu]

This removes unnecessary duplication of "Profiles" prefix when the struct/package has already profile in it, also brings consistency with proto definition.

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.86%. Comparing base (b302feb) to head (e964d46).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pdata/pprofile/profiles.go	0.00%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (60.00%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project status has failed because the head coverage (87.86%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13644      +/-   ##
==========================================
- Coverage   87.88%   87.86%   -0.02%     
==========================================
  Files         632      632              
  Lines       39516    39518       +2     
==========================================
- Hits        34727    34723       -4     
- Misses       3567     3572       +5     
- Partials     1222     1223       +1     

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