Add tests for skip magic trailing comma

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## Summary

This PR adds tests that verify that the magic trailing comma is not respected if disabled in the formatter options. 

Our test setup now allows to create a `<fixture-name>.options.json` file that contains an array of configurations that should be tested. 

<!-- What's the purpose of the change? What does it do, and why? -->

## Test Plan

It's all about tests :) 

<!-- How was it tested? -->

crates/ruff_python_formatter/resources/test/fixtures/ruff/skip_magic_trailing_comma.options.json

@@ -0,0 +1,8 @@
+[
+  {
+    "magic_trailing_comma": "respect"
+  },
+  {
+    "magic_trailing_comma": "ignore"
+  }
+]

crates/ruff_python_formatter/resources/test/fixtures/ruff/skip_magic_trailing_comma.py

@@ -0,0 +1,22 @@
+(
+    "First entry",
+    "Second entry",
+    "last with trailing comma",
+)
+
+(
+    "First entry",
+    "Second entry",
+    "last without trailing comma"
+)
+
+(
+    "First entry",
+    "Second entry",
+    "third entry",
+    "fourth entry",
+    "fifth entry",
+    "sixt entry",
+    "seventh entry",
+    "eigth entry",
+)