fetch error loses stack context

repro from #2328

without the Error.captureStackTrace in index.js:

NODE_V8_COVERAGE='./coverage/tmp' node test.mjs
/var/github/undici/lib/compat/dispatcher-weakref.js:25
    dispatcher.on('disconnect', () => {
               ^

TypeError: dispatcher.on is not a function
    at CompatFinalizer.register (/var/github/undici/lib/compat/dispatcher-weakref.js:25:16)
    at new Request (/var/github/undici/lib/fetch/request.js:391:26)
    at fetch (/var/github/undici/lib/fetch/index.js:136:21)
    at fetch (/var/github/undici/index.js:107:20)
    at file:///var/github/undici/test.mjs:5:7
    at ModuleJob.run (node:internal/modules/esm/module_job:217:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:308:24)
    at async loadESM (node:internal/process/esm_loader:42:7)
    at async handleMainPromise (node:internal/modules/run_main:66:12)

Node.js v20.6.1

with:

 NODE_V8_COVERAGE='./coverage/tmp' node test.mjs
/var/github/undici/index.js:110
        Error.captureStackTrace(err, this)
              ^

TypeError: dispatcher.on is not a function
    at fetch (/var/github/undici/index.js:110:15)
    at async file:///var/github/undici/test.mjs:5:1

Node.js v20.6.1

Compare the stack traces in index.js with the failing path through lib/compat/dispatcher-weakref.js, fetch/request.js, and fetch/index.js. Reproduce the report with test.mjs and NODE_V8_COVERAGE, then ensure the resulting fetch error retains useful caller context without losing the original TypeError.