test: re-enable HTTP/2 churn test on Node.js 26

[mcollina]

Summary

Re-enable the HTTP/2 connection-churn stress test (test/http2-request-never-settles.js) on Node.js 26, while keeping it skipped on Node.js 22 (and the pre-existing Node.js 24/25 Maglev skip).

Motivation

The test was skipped on Node.js 26 (#5742) because node:http2 aborted on an internal onread->IsFunction() assertion during session teardown — nodejs/node#64850.

The same assertion still affects the latest Node.js 22.x, whose fix has not been backported yet.

Verification

• http2: fix onread assert when destroying session from stream handler node#65116 ("http2: fix onread assert when destroying session from stream handler", commit 205443721d) fixes http2: assertion failure onread->IsFunction() when a session is destroyed from a 'stream' handler node#64850.
• It is not in Node.js v26.9.0 but is in Node.js v26.10.0 (confirmed in the v26.10.0 release notes).
• I ran the test file directly with Node.js v26.10.0 (multiple times): it runs and passes (tests 2, pass 2, fail 0, skipped 0).
• With Node.js v22.23.3 (latest 22.x, what CI uses): it now skips (skipped 2), avoiding the onread->IsFunction() abort that currently crashes CI.
• The existing Node.js 24/25 skips for nodejs/node#64841 still work.

Change

• Node.js 26: skip only pre-fix builds (nodeMajor === 26 && nodeMinor < 10); current/future 26.x (≥ 26.10.0) runs the test.
• Node.js 22: keep skipping entirely until the v22.x backport (nodejs/node#66515, still open) is released.

- const skipForOnreadAssertion = nodeMajor === 26
+ // nodejs/node#64850 was fixed by nodejs/node#65116, first shipped in v26.10.0.
+ // The v22.x backport (nodejs/node#66515) has not been released yet.
+ const skipForOnreadAssertion =
+   nodeMajor === 22 ||
+   (nodeMajor === 26 && nodeMinor < 10)

The unrelated Node.js 24/25 Maglev SIGSEGV skip (nodejs/node#64841, still open) is preserved.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.13%. Comparing base (eedbe2d) to head (dd6cd49).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5961      +/-   ##
==========================================
+ Coverage   86.11%   86.13%   +0.01%     
==========================================
  Files         115      115              
  Lines       45723    45727       +4     
==========================================
+ Hits        39376    39386      +10     
+ Misses       6347     6341       -6     

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