fix(sdk-trace-web): make parseUrl respect document.baseURI

[domasx2]

Which problem is this PR solving?

Noticed that fetch instrumentation breaks web apps that provide relative urls to window.fetch and have URL base explicitly set via a base element. The root cause seems to be parseUrl, which resolves absolute URL using location.href as URL base when it should use document.baseURI.

Short description of the changes

Makes parseUrl use document.baseURI when available and fall back to location.href when not (web workers).

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

I'm attempting to instrument Grafana frontend with tracing. If fetch instrumentation is enabled, dashboards do not load due to mangled API request URLs. Applying this fix resolves the issue.

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

Merging #3670 (a34f668) into main (52facfa) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head a34f668 differs from pull request most recent head 814af56. Consider uploading reports for the commit 814af56 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3670   +/-   ##
=======================================
  Coverage   93.71%   93.71%           
=======================================
  Files         277      277           
  Lines        8454     8455    +1     
  Branches     1761     1762    +1     
=======================================
+ Hits         7923     7924    +1     
  Misses        531      531           

Impacted Files	Coverage Δ
packages/opentelemetry-sdk-trace-web/src/utils.ts	95.09% <100.00%> (+0.03%)	⬆️

[dyladan]

Looks like you have a lint failure. Please also make a changelog entry to CHANGELOG.md

[domasx2]

Looks like you have a lint failure. Please also make a changelog entry to CHANGELOG.md

Thanks @dyladan ! Updated changelog. Lint failure seems to be 503 to npmjs.com when linting docs, but the same link works now and lint passes locally. Likely a temporary issue at the time

[dyladan]

Please do not force push during the review process. It makes it more difficult to see what has changed since the last review, breaks comments on previous commits, and breaks links to previous commits.