test: rename regression tests with descriptive file names (pt. 5)
Rename the tests appropriately alongside mentioning the subsystem Also, make a few basic changes to make sure the tests conform to the standard test structure
Refs: https://github.com/nodejs/node/issues/19105 Refs: https://github.com/nodejs/node/blob/master/doc/guides/writing-tests.md#test-structure
Checklist
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test/parallel/test-arm-math-exp-regress-1376.js -
test/parallel/test-buffer-regression-649.js -
test/parallel/test-dgram-regress-4496.js -
test/parallel/test-dns-regress-7070.js -
test/parallel/test-http-agent-maxsockets-regress-4050.js