fix: align globalThis fallbacks with otel-core

[legendecas]

Related: open-telemetry/opentelemetry-js#2465

[codecov]

Codecov Report

Merging #126 (c3de0f8) into main (50db1c2) will decrease coverage by 0.64%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
- Coverage   95.11%   94.46%   -0.65%     
==========================================
  Files          42       42              
  Lines         573      578       +5     
  Branches       90       94       +4     
==========================================
+ Hits          545      546       +1     
- Misses         28       32       +4     

Impacted Files	Coverage Δ
src/platform/browser/globalThis.ts	33.33% <33.33%> (-66.67%)	⬇️

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[legendecas]

Linter complaints should be able to be fixed by #127.

[vmarchaud]

@dyladan If you are good with this we can merge this one and #127 after ?