semaphore: stop building and running extra unit tests

This slows down the build, which is often near the 1hr limit. There are
other jobs running the extra unit tests.

(cherry picked from commit 3bc5480)
(cherry picked from commit 52afaa8)
(cherry picked from commit 3891c50)
(cherry picked from commit 0c82cc2)

Author: bluca

.semaphore/semaphore-runner.sh

@@ -92,7 +92,7 @@ EOF
             # disable autopkgtests which are not for upstream
             sed -i '/# NOUPSTREAM/ q' debian/tests/control
             # enable more unit tests
-            sed -i '/^CONFFLAGS =/ s/=/= --werror -Dtests=unsafe -Dsplit-usr=true -Dslow-tests=true -Dfuzz-tests=true -Dman=true /' debian/rules
+            sed -i '/^CONFFLAGS =/ s/=/= --werror -Dsplit-usr=true /' debian/rules
             # no orig tarball
             echo '1.0' >debian/source/format