chore: migrate coverage cfg to pyproject.toml (#32650)

chore: move coverage cfg to pyproject

.coveragerc

@@ -1,12 +0,0 @@
-[run]
-source=transformers
-omit =
-    # skip convertion scripts from testing for now
-    */convert_*
-    */__main__.py
-[report]
-exclude_lines =
-    pragma: no cover
-    raise
-    except
-    register_parameter

pyproject.toml

@@ -1,3 +1,18 @@
+[tool.coverage.run]
+source = ["transformers"]
+omit = [
+    "*/convert_*",
+    "*/__main__.py"
+]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "raise",
+    "except",
+    "register_parameter"
+]
+
 [tool.ruff]
 line-length = 119