refactor: move http testing examples to subdirectory

[coryan]

No description provided.

[codecov]

Codecov Report

Merging #190 (6ec7779) into main (1c99888) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #190   +/-   ##
=======================================
  Coverage   97.54%   97.54%           
=======================================
  Files          65       65           
  Lines        1551     1551           
=======================================
  Hits         1513     1513           
  Misses         38       38           

Impacted Files	Coverage Δ
...mples/site/testing_http/http_integration_server.cc	0.00% <ø> (ø)
...xamples/site/testing_http/http_integration_test.cc	89.79% <ø> (ø)
examples/site/testing_http/http_unit_test.cc	100.00% <ø> (ø)

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