fix: linkedin announce api changes

[gabrielcipriano]

Closes #4421

I chose to keep getProfileID as getProfileIDLegacy and use it as a fallback if getProfileSub fails because of permission scope.

In this way, it's not a breaking change because one that has only a deprecated permissions such as r_liteprofile will still be able to hit v2/me

this logic is encapsulated in the new function getProfileURN, that resolves the user identifier and returns it formatted as a URN

[codecov]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (57f2532) 83.90% compared to head (32916b0) 83.80%.

Files	Patch %	Lines
internal/pipe/linkedin/client.go	57.44%	14 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4428      +/-   ##
==========================================
- Coverage   83.90%   83.80%   -0.10%     
==========================================
  Files         133      133              
  Lines       12769    12810      +41     
==========================================
+ Hits        10714    10736      +22     
- Misses       1637     1650      +13     
- Partials      418      424       +6     

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[caarlos0]

awesome, thank you!