test: rename regression tests with descriptive file names
Rename the tests appropriately alongside mentioning the subsystem Also, make a few basic changes to make sure the tests conforms 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-regress-GH-1531.js -
test/parallel/test-regress-GH-2245.js -
test/parallel/test-regress-GH-3238.js -
test/parallel/test-regress-GH-3542.js -
test/parallel/test-regress-GH-3739.js -
test/parallel/test-regress-GH-4256.js