fix: Fixed Azure functions crashing when they include response headers

[jsumners-nr]

When an Azure function includes headers in the response object, our instrumentation was crashing at:

node-newrelic/lib/header-attributes.js

Line 137 in 0ae24b8

segment.addSpanAttribute(attributeName, header)

This is because the segment was unavailable at:

node-newrelic/lib/header-attributes.js

Line 120 in 0ae24b8

const segment = transaction.agent.tracer.getSegment()

The root cause is that our transaction finalization was not happening within the right context.

[jsumners-nr]

This is to work around an issue in the latest LTS releases:

• https://jdstaerk.substack.com/p/nodejs-security-fix-silently-broke
• nodejs/node@bc0b53813e
• http: node-fetch throws ERR_STREAM_PREMATURE_CLOSE on keep-alive socket closures after latest security releases nodejs/node#63989
• http: avoid stream listeners on idle agent sockets nodejs/node#64004

We should be able to restore this in a week or so after new versions ship.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.06%. Comparing base (db6e4e3) to head (61a8110).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
.../subscribers/azure-functions/azure-handler-base.js	0.00%	16 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (db6e4e3) and HEAD (61a8110). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (db6e4e3)	HEAD (61a8110)
versioned-tests-22.x	1	0
versioned-tests-24.x	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4070      +/-   ##
==========================================
- Coverage   97.41%   90.06%   -7.36%     
==========================================
  Files         514      501      -13     
  Lines       61727    59885    -1842     
  Branches        1        1              
==========================================
- Hits        60133    53934    -6199     
- Misses       1594     5951    +4357     

Flag	Coverage Δ
integration-tests-cjs-22.x	73.64% <0.00%> (-0.02%)	⬇️
integration-tests-cjs-24.x	74.25% <0.00%> (-0.02%)	⬇️
integration-tests-esm-22.x	54.00% <0.00%> (-0.02%)	⬇️
integration-tests-esm-24.x	55.17% <0.00%> (-0.02%)	⬇️
unit-tests-22.x	89.09% <0.00%> (-0.02%)	⬇️
unit-tests-24.x	89.09% <0.00%> (-0.02%)	⬇️
versioned-tests-22.x	?
versioned-tests-24.x	?

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