✨ Rename Replay plan to Premium plan

[MirandaKapin]

Motivation

New premium plan name to reduce confusion between replay feature and replay plan.

Changes

• introduce premiumSampleRate option and deprecate replaySampleRate
• rename replay plan occurrences to premium

Testing

• Local
• Staging
• Unit
• End to end

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1534 (bd9f87f) into main (3a004b2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1534   +/-   ##
=======================================
  Coverage   90.48%   90.49%           
=======================================
  Files         116      116           
  Lines        4478     4480    +2     
  Branches     1004     1005    +1     
=======================================
+ Hits         4052     4054    +2     
  Misses        426      426           

Impacted Files	Coverage Δ
packages/rum-core/src/domain/assembly.ts	100.00% <100.00%> (ø)
packages/rum-core/src/domain/configuration.ts	96.66% <100.00%> (+0.23%)	⬆️
packages/rum-core/src/domain/rumSessionManager.ts	88.23% <100.00%> (ø)
packages/rum-core/test/mockRumSessionManager.ts	100.00% <100.00%> (ø)
packages/rum/src/boot/recorderApi.ts	95.91% <100.00%> (ø)

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[maycmlee]

👍 for docs.