Previously, the test would make an HTTP request and, as soon as the
response was received, it would check the presence and value of the
http.server.requests meter. This create a race condition between the
meter being registered once the response had been flushed and the
meter's presence being checked. If the check won the race, the test
would fail.

This commit updates the test to wait for up to 5 seconds for the
meter to be present and have a count of 1, matching the single request
that has been made.

Fixes gh-23919

Closes gh-23773

Closes gh-23772

Closes gh-23910

Closes gh-23769

Closes gh-23792

Closes gh-23862

Closes gh-23861

Closes gh-23860

Closes gh-23859

Closes gh-23858

Closes gh-23857

Closes gh-23856

Closes gh-23855

Closes gh-23854

Closes gh-23853

Closes gh-23852

Closes gh-23851

Closes gh-23850

Closes gh-23849

Closes gh-23848

Closes gh-23847

Closes gh-23846

Closes gh-23845

Closes gh-23844

Closes gh-23843

Closes gh-23842

Closes gh-23841

Closes gh-23840

Closes gh-23839

Closes gh-23838

Closes gh-23837

Closes gh-23836

Closes gh-23835

Closes gh-23834

Closes gh-23833

Closes gh-23832