[v21.x backport] test: move http to subfolder

[RedYetiDev]

Backport of #52875
Blocked by #52901

This PR moves all of the parallel/test-http-* files into parallel/http/test-*. If this change goes well, I look to implement it throughout the entire parallel folder (one subsystem at a time)

IMO, the DX will be much easier with this change, as searching through tests will become simpler, as users can simply visit the test/parallel/<subsystem> directory.

From a maintenance point of view, CODEOWNERS and label rules should be simpler, as a subdirectory now exists for these subsystems.

The http subsystem is largest subsystem (in number of test files), so I decided to handle it first.

[RedYetiDev]

@nodejs/backporters
@nodejs/testing

[RedYetiDev]

Linter and other tests may fail for this PR until the blocking PR (#52901) lands.

[marco-ippolito]

Why backporting on v21? I dont think we are going to release a new v21 unless its a security release

[RedYetiDev]

Why backporting on v21? I dont think we are going to release a new v21 unless its a security release

Oh, right, I'll backport to v20 instead. Even so, #52901 needs to land first.