doc(just): add deprecation warning to just xtest commands

Signed-off-by: Sandro-Alessio Gierens <sandro@gierens.de>

Justfile

@@ -46,14 +46,17 @@ alias itest := integration_tests
 
 # run extended tests
 @xtests:
+    echo "XTESTS ARE DEPRECATED DON'T USE"
     xtests/run.sh
 
 # run extended tests (using the release mode exa)
 @xtests-release:
+    echo "XTESTS ARE DEPRECATED DON'T USE"
     xtests/run.sh --release
 
 # display the number of extended tests that get run
 @count-xtests:
+    echo "XTESTS ARE DEPRECATED DON'T USE"
     grep -F '[[cmd]]' -R xtests | wc -l
 
 
@@ -84,6 +87,7 @@ alias itest := integration_tests
 
 # build exa and run extended tests with features disabled
 @feature-checks *args:
+    echo "XTESTS ARE DEPRECATED DON'T USE"
     cargo build --no-default-features
     specsheet xtests/features/none.toml -shide {{args}} \
         -O cmd.target.exa="${CARGO_TARGET_DIR:-../../target}/debug/exa"