Revert "Set nextest behavior on empty runs more explicitly"

This reverts commit 2fc93f7. The
change to the `justfile` should be kept, but is temporarily
reverted to verify that the change in `ci.yml` is no longer needed.

.github/workflows/ci.yml

@@ -19,7 +19,6 @@ permissions:
 env:
   CARGO_TERM_COLOR: always
   CLICOLOR: '1'
-  NEXTEST_NO_TESTS: fail
 
 jobs:
   pure-rust-build:

justfile

@@ -186,7 +186,7 @@ unit-tests:
     cargo nextest run -p gix --no-default-features --features basic,extras,comfort,need-more-recent-msrv
     cargo nextest run -p gix --features async-network-client
     cargo nextest run -p gix --features blocking-network-client
-    cargo nextest run -p gitoxide-core --lib --no-tests=warn
+    cargo nextest run -p gitoxide-core --lib
 
 # These tests aren't run by default as they are flaky (even locally)
 unit-tests-flaky: