🐛 fix isolatedModules support

[BenoitZugmeyer]

Motivation

Support TS projects using isolatedModules: true

This PR fixes #2208.

Bug reported here: microsoft/TypeScript#54152

Changes

• add an integration test to make sure we are compatible with this option
• use a workaround to fix the TS error

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[yannickadam]

While alternatives exists, they have impacts on the bundle size:
enum => ~ +1800 bytes
const object => ~ + 120 bytes
Since we do not consider that LifeCycleEventType needs to be exposed, this workaround seems to be the most appropriate for now.

[codecov-commenter]

Codecov Report

Merging #2209 (514fac0) into main (549b3e8) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2209      +/-   ##
==========================================
- Coverage   93.85%   93.83%   -0.02%     
==========================================
  Files         201      201              
  Lines        6082     6082              
  Branches     1347     1347              
==========================================
- Hits         5708     5707       -1     
- Misses        374      375       +1     

Impacted Files	Coverage Δ
packages/rum-core/src/domain/lifeCycle.ts	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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