ci: Set the tests sleeps multiplier as env variable

While we're trying to do this smartly checking the build information for
the binaries we're testing, this doesn't work particularly well in some
test binaries (debug.BuildInfo Settings are inconsistently exposed).

So, let's just be consitent in CI, ensuring that wait times are
multiplied as expected.

.github/workflows/qa.yaml

@@ -246,6 +246,7 @@ jobs:
         if: matrix.test == 'race'
         env:
           GO_TESTS_TIMEOUT: 35m
+          AUTHD_TESTS_SLEEP_MULTIPLIER: 3
         run: |
           go test -json -timeout ${GO_TESTS_TIMEOUT} -race ./... | \
             gotestfmt --logfile "${AUTHD_TEST_ARTIFACTS_PATH}/gotestfmt.race.log"
@@ -258,6 +259,7 @@ jobs:
           CGO_CFLAGS: "-O0 -g3 -fno-omit-frame-pointer"
           G_DEBUG: "fatal-criticals"
           GO_TESTS_TIMEOUT: 30m
+          AUTHD_TESTS_SLEEP_MULTIPLIER: 1.5
           # Use these flags to give ASAN a better time to unwind the stack trace
           GO_GC_FLAGS: -N -l
         run: |