test: workaround spurious test failures in http2 tests with node v8

[trentm]

Closes: #2409

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The http2 tests have been occasionally crashy in CI for a long time.. and more so in GH Actions of late. Let's just skip these tests. The need to run them is very low.

[apmmachine]

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• Start Time: 2023-03-29T20:35:07.089+0000

• Duration: 34 min 18 sec

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