test(instr-undici): fix TAV failures with Node.js 14 and 16

[trentm]

Test all versions (TAV) tests were failing with Node.js 14 and 16
because of subtle behaviour changes in socket end handling in
Node.js and undici for a test that tries a bogus request. This
restores earlier work-around code mistakenly removed in #2085.

---

Since #2085, TAV tests for Node.js 14 and 16 started failing. E.g.: https://github.com/open-telemetry/opentelemetry-js-contrib/actions/runs/8724672054/job/23935801386

> @opentelemetry/instrumentation-undici@0.1.0 test-all-versions
> tav

-- required packages ["undici@5.28.4"]
-- installing ["undici@5.28.4"]
-- running test "npm run test" with undici (env: {})

> @opentelemetry/instrumentation-undici@0.1.0 test
> nyc ts-mocha -p tsconfig.json test/**/*.test.ts

...
   UndiciInstrumentation `undici` tests
    disable()
      ✓ should not create spans when disabled
    enable()
      ✓ should ignore requests based on the result of ignoreRequestHook
      1) should create valid spans for different request methods
      ✓ should create valid spans for "request" method
      - should create valid spans for "fetch" method
      ✓ should create valid spans for "stream" method
      ✓ should create valid spans for "dispatch" method
      ✓ should create valid spans even if the configuration hooks fail
      ✓ should not create spans without parent if required in configuration
      ✓ should create spans with parent if required in configuration
      ✓ should capture errors while doing request (41ms)
      - should capture error if undici request is aborted


  9 passing (165ms)
  12 pending
  1 failing

  1) UndiciInstrumentation `undici` tests
       enable()
         should create valid spans for different request methods:
     SocketError: other side closed
      at Socket.onSocketEnd (node_modules/undici/lib/client.js:1118:22)
      at endReadableNT (internal/streams/readable.js:1333:12)
      at processTicksAndRejections (internal/process/task_queues.js:82:21)

Back in #2085 (comment) a similar issue with undici + older Node.js versions + this testing of a bogus request was hit and I mistakenly assumed it was the same issue. The workaround for that other issue did not fix this one. This PR restores the same/similar workaround.

[codecov]

Codecov Report

Merging #2111 (9ab8a55) into main (dfb2dff) will decrease coverage by 0.21%.
Report is 56 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2111      +/-   ##
==========================================
- Coverage   90.97%   90.77%   -0.21%     
==========================================
  Files         146      148       +2     
  Lines        7492     7675     +183     
  Branches     1502     1539      +37     
==========================================
+ Hits         6816     6967     +151     
- Misses        676      708      +32     

see 8 files with indirect coverage changes