test(document-load): align OTel test setup with current sdk-trace API

[overbalance]

What problem is this solving?

The DocumentLoadInstrumentation test used APIs from @opentelemetry/sdk-trace-base that no longer match the current OpenTelemetry SDK surface after the recent dependency bump. BasicTracerProvider, the positional SimpleSpanProcessor(exporter) constructor, and the sdk-trace-base import path have been superseded.

Short description of changes

• Import ReadableSpan, InMemorySpanExporter, SimpleSpanProcessor, and TracerProvider from @opentelemetry/sdk-trace instead of @opentelemetry/sdk-trace-base.
• Replace BasicTracerProvider with TracerProvider.
• Use the object-form constructor new SimpleSpanProcessor({ exporter }).

How has this been tested?

Ran the document-load instrumentation unit tests locally.

Checklist

• Documentation added
• Tests added

[github-actions]

Chrome DevTools Protocol Tracing (Script: 116.63ms, Heap: 12.95MB)

	Number of Requests	Size of Requests	Script Duration	Task Duration	Heap Used Size
Requests	+13 requests	+41.77 KB
Page Loaded			+19.66 ms	+20.48 ms	+1.16 MB
Generate 100 fetch requests			+21.14 ms	+87.03 ms	+1.64 MB
Generate 100 XHR requests			+38.68 ms	+85.56 ms	+2.71 MB
Click 100 buttons and generate 100 logs			+26.84 ms	+48.39 ms	+2.17 MB
Throw a 100 exceptions			-0.19 ms	+31.67 ms	+2.15 MB
End Session			+10.49 ms	+34.88 ms	+3.12 MB
Total	+13 requests	+41.77 KB	+116.63 ms	+308.01 ms	+12.95 MB

Lighthouse (Script Eval: 128.23ms)

	Difference	Description
Total Blocking Time	+1 ms	Difference in Total Blocking Time: Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more about the Total Blocking Time metric.
Main Thread Time	+99.71 ms	Difference in Main Thread Time: Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work
Script Evaluation Time	+128.23 ms	Difference in Script Evaluation Time: Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Platform Tests (vite-7 es2015 gzip: 69.66KB)

vite-6 Platform Tests

	Total Uncompressed Size	Total Gzip Size
vite-6 - es2015	+203.00 KB	+69.70 KB

vite-7 Platform Tests

	Total Uncompressed Size	Total Gzip Size
vite-7 - es2015	+203.00 KB	+69.66 KB

webpack-5 Platform Tests

	Total Uncompressed Size	Total Gzip Size
webpack-5 - es2015	0 KB	0 KB