🐛[RUMF-1435] don't retry opaque response

[bcaudan]

Motivation

If the browser somehow consider the intake response as opaque, we won't be able to access its true status and may wrongly retry it.

Changes

• do not retry opaque response
• force request mode 'cors'
• add extra debug tag with response type

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1877 (c45cc0f) into main (e5c2966) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1877      +/-   ##
==========================================
+ Coverage   93.12%   93.20%   +0.08%     
==========================================
  Files         137      137              
  Lines        5165     5168       +3     
  Branches     1153     1155       +2     
==========================================
+ Hits         4810     4817       +7     
+ Misses        355      351       -4     

Impacted Files	Coverage Δ
...s/core/src/domain/configuration/endpointBuilder.ts	100.00% <100.00%> (ø)
packages/core/src/transport/httpRequest.ts	97.95% <100.00%> (ø)
...ckages/core/src/transport/sendWithRetryStrategy.ts	100.00% <100.00%> (ø)
...rum-core/src/domain/contexts/foregroundContexts.ts	96.92% <0.00%> (+6.15%)	⬆️

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