🐛 Fix unit test format validation

[bcaudan]

Motivation

events were validated on wrong schema 🤦

Changes

• use the correct schema
• make rum-events-format to track master
• fix unit tests to pass validation

Testing

unit tests

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I have gone over the contributing documentation.

[codecov-io]

Codecov Report

Merging #598 into master will decrease coverage by 0.02%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master     #598      +/-   ##
==========================================
- Coverage   88.60%   88.57%   -0.03%     
==========================================
  Files          53       54       +1     
  Lines        2484     2495      +11     
  Branches      534      540       +6     
==========================================
+ Hits         2201     2210       +9     
- Misses        283      285       +2     

Impacted Files	Coverage Δ
packages/rum/test/formatValidation.ts	80.00% <50.00%> (-3.34%)	⬇️
packages/rum/test/createRawRumEvent.ts	100.00% <100.00%> (ø)
packages/rum/src/transport/batch.ts	65.85% <0.00%> (-2.44%)	⬇️
packages/rum/src/browser/performanceCollection.ts	62.85% <0.00%> (-1.43%)	⬇️

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