Revert "Use eunit for testing leptus_req"

This reverts commit b7ed8a9ad21a8c75db99b818452f2382e8605abd.
Revert "Add leptus_eunit_SUITE"

This reverts commit a20a043a06e59737d12f35a92f5113cf9bfc878f.

Conflicts:
	test/leptus_eunit_SUITE.erl
Add leptus_req to CT_SUITES