✅ fix Jasmine deprecation warning in unit tests/IE

[BenoitZugmeyer]

Motivation

"DEPRECATION: describe with no children (describe() or it()) is deprecated and will be removed in a future version of Jasmine."

Changes

Wrapping the describe in a if statement is not really pretty. Ideally we would use "shadow dom" APIs inside beforeEach or it blocks instead of describe, but this prevents us from using a list to generate test cases.

I think it's acceptable until we eventually drop IE support.

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1974 (bf013cc) into main (57d9e2a) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1974      +/-   ##
==========================================
+ Coverage   93.34%   93.43%   +0.09%     
==========================================
  Files         144      144              
  Lines        5482     5482              
  Branches     1246     1246              
==========================================
+ Hits         5117     5122       +5     
+ Misses        365      360       -5     

Impacted Files	Coverage Δ
...ackages/rum-core/src/domain/waitPageActivityEnd.ts	100.00% <0.00%> (+1.53%)	⬆️
...rum-core/src/domain/contexts/foregroundContexts.ts	96.92% <0.00%> (+6.15%)	⬆️

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