Changing HttpUrlConnection instr to not rely on segment/cleanup thread

[meiao]

Overview

This code reverts the HttpURLConnection instrumentation to something more similar with the instrumentation on 7.11.
But it fixes one problem where the externals/DT were not always in the correct span.

Related Github Issue

Fixes #1378

Checks

• Are your contributions backwards compatible with relevant frameworks and APIs?
• Does your code contain any breaking changes? Please describe.
• Does your code introduce any new dependencies? Please describe.

[codecov-commenter]

Codecov Report

Merging #1537 (afe7295) into main (2c20813) will decrease coverage by 0.03%.
Report is 26 commits behind head on main.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1537      +/-   ##
============================================
- Coverage     70.60%   70.58%   -0.03%     
- Complexity     9745     9754       +9     
============================================
  Files           813      814       +1     
  Lines         39264    39300      +36     
  Branches       5962     5967       +5     
============================================
+ Hits          27723    27738      +15     
- Misses         8856     8871      +15     
- Partials       2685     2691       +6     

see 22 files with indirect coverage changes

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[contentfree]

@meiao Do you have insight into when this change will land in a release of the java agent?

[jtduffy]

@contentfree This will be available in the next release, targeted for Oct 26th.