test: skip Elasticsearch tests on Node 20

[bizob2828]

For some reason the versioned tests for elasticsearch are timing out but only run on main. They work just fine in branches. I spent a lot of time trying to track it down and do not want to block the main line any longer. I plan on continuing triage but will do so async.

[codecov]

Codecov Report

Merging #1797 (90f8448) into main (9ca78ae) will decrease coverage by 0.06%.
Report is 3 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1797      +/-   ##
==========================================
- Coverage   96.84%   96.78%   -0.06%     
==========================================
  Files         198      199       +1     
  Lines       38755    38901     +146     
==========================================
+ Hits        37531    37652     +121     
- Misses       1224     1249      +25     

Flag	Coverage Δ
integration-tests-16.x	78.86% <100.00%> (+0.01%)	⬆️
integration-tests-18.x	79.12% <100.00%> (+<0.01%)	⬆️
integration-tests-20.x	79.13% <100.00%> (+<0.01%)	⬆️
unit-tests-16.x	91.38% <85.61%> (-0.03%)	⬇️
unit-tests-18.x	91.36% <85.61%> (-0.03%)	⬇️
unit-tests-20.x	91.36% <85.61%> (-0.03%)	⬇️
versioned-tests-16.x	73.03% <93.83%> (-2.59%)	⬇️
versioned-tests-18.x	73.03% <93.83%> (-2.59%)	⬇️
versioned-tests-20.x	72.94% <100.00%> (-2.69%)	⬇️

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Files	Coverage Δ
lib/instrumentation/@elastic/elasticsearch.js	100.00% <100.00%> (ø)
lib/instrumentations.js	100.00% <100.00%> (ø)
lib/shim/datastore-shim.js	99.41% <100.00%> (+<0.01%)	⬆️

... and 5 files with indirect coverage changes

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