🐛 [RUMF-1491] fix error when calling fetch with an unexpected value as first parameter

[BenoitZugmeyer]

Motivation

When called with anything other than Request as a first argument, fetch will use the string representation of the first parameter as an URL. For example:

fetch({ toString() { return 'toto' }}) // equivalent to fetch("toto")
fetch(null) // equivalent to fetch("null")
fetch() // equivalent to fetch("undefined")

Our fetch instrumentation does not support such usage and crashes with the following errors:

URL constructor: null is not a valid URL.
Cannot read properties of null (reading 'url')

Changes

• consider the input argument unknown
• make sure we don't crash with unknown values
• make sure the correct method and URL are correctly infered from unknown values
• make sure the requestInput is passed untouched in the event domain

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #2061 (8592c97) into main (6c436f1) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2061      +/-   ##
==========================================
- Coverage   93.57%   93.44%   -0.13%     
==========================================
  Files         156      156              
  Lines        5522     5522              
  Branches     1256     1256              
==========================================
- Hits         5167     5160       -7     
- Misses        355      362       +7     

Impacted Files	Coverage Δ
packages/rum-core/src/domain/requestCollection.ts	100.00% <ø> (ø)
packages/core/src/browser/fetchObservable.ts	95.12% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[BenoitZugmeyer]

Current dependencies on/for this PR:

• main
  • PR 🐛 [RUMF-1491] fix error when calling fetch with an unexpected value as first parameter #2061 👈
    • PR ⬆️ update @typescript-eslint/* #2095
    • PR 👷 Update dependency typescript to v4.9.5 #2094

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