chore: Bump version to 2.0.0-rc.2 and update CHANGELOG.md

[nielsenko]

Prep for release

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[nielsenko]

This includes breaking changes, but none that impacts serverpod. Also, we are still pre-2.0.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.49%. Comparing base (ab9d5f4) to head (8f35bc3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #389      +/-   ##
==========================================
- Coverage   92.50%   92.49%   -0.02%     
==========================================
  Files         117      117              
  Lines        5260     5260              
  Branches     2634     2634              
==========================================
- Hits         4866     4865       -1     
- Misses        394      395       +1     

Flag	Coverage Δ
relic_core	92.55% <ø> (-0.03%)	⬇️
relic_io	91.96% <ø> (ø)

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