Auto merge of #10638 - Muscraft:move-snapshot-tests, r=epage

Move snapshot tests into testsuite

This moves all tests from the `snapshot` folder into the `testsuite` folder as described by [this comment](#10631 (comment)). A macro was also added so there is no need to specify the path in a `snapshot` test just the file. This was done for ease of refactoring and ease of porting new tests to `snapshot`

close #10627

r? `@epage`

Author: bors

crates/cargo-test-support/src/lib.rs

@@ -32,6 +32,13 @@ macro_rules! t {
     };
 }
 
+#[macro_export]
+macro_rules! curr_dir {
+    () => {
+        std::path::Path::new(file!()).parent().unwrap()
+    };
+}
+
 #[track_caller]
 pub fn panic_error(what: &str, err: impl Into<anyhow::Error>) -> ! {
     let err = err.into();