fix(apps/oxlint): incorrect matching in .oxlintignore (#7566)

The issue was discovered while updating test cases in `rolldown`.

In the `.oxlintignore` file, we have:
```ignore
tests/**
```

When running the command by `lint-staged`:

```bash
oxlint -c .oxlintrc.json --ignore-path=.oxlintignore --deny-warnings "tests/function/main.js"
```

The file `main.js` gets linted despite being ignored. This happens
because, before using `Gitignore::new`, we converted paths to absolute
paths, causing the pattern `tests/**` to not match
`D:/rolldown/tests/function/main.js` correctly.


c61a383e8c/apps/oxlint/src/lint.rs (L60-L78)

apps/oxlint/fixtures/issue_7566/.oxlintignore

@@ -0,0 +1 @@
+tests/**

apps/oxlint/fixtures/issue_7566/tests/function/main.js

@@ -0,0 +1 @@
+123 == NaN;

apps/oxlint/fixtures/issue_7566/tests/main.js

@@ -0,0 +1 @@
+123 == NaN;

apps/oxlint/src/lint.rs

@@ -57,16 +57,6 @@ impl Runner for LintRunner {
         let provided_path_count = paths.len();
         let now = Instant::now();
 
-        // append cwd to all paths
-        paths = paths
-            .into_iter()
-            .map(|x| {
-                let mut path_with_cwd = self.cwd.clone();
-                path_with_cwd.push(x);
-                path_with_cwd
-            })
-            .collect();
-
         // The ignore crate whitelists explicit paths, but priority
         // should be given to the ignore file. Many users lint
         // automatically and pass a list of changed files explicitly.
@@ -77,6 +67,16 @@ impl Runner for LintRunner {
             paths.retain(|p| if p.is_dir() { true } else { !ignore.matched(p, false).is_ignore() });
         }
 
+        // Append cwd to all paths
+        paths = paths
+            .into_iter()
+            .map(|x| {
+                let mut path_with_cwd = self.cwd.clone();
+                path_with_cwd.push(x);
+                path_with_cwd
+            })
+            .collect();
+
         if paths.is_empty() {
             // If explicit paths were provided, but all have been
             // filtered, return early.
@@ -777,4 +777,19 @@ mod test {
         ]);
         assert_eq!(result.number_of_files, 1);
     }
+
+    // Issue: <https://github.com/oxc-project/oxc/pull/7566>
+    #[test]
+    fn ignore_path_with_relative_files() {
+        let args = &[
+            "--ignore-path",
+            "fixtures/issue_7566/.oxlintignore",
+            "fixtures/issue_7566/tests/main.js",
+            "fixtures/issue_7566/tests/function/main.js",
+        ];
+        let result = test(args);
+        assert_eq!(result.number_of_files, 0);
+        assert_eq!(result.number_of_warnings, 0);
+        assert_eq!(result.number_of_errors, 0);
+    }
 }