🔧 update Python coverage configuration (#811)

## Description

This small PR updates the Python coverage collection configuration to
exclude additional constructs that may not be possible to cover by
tests.

## Checklist:

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- [x] The pull request only contains commits that are related to it.
- [x] I have added appropriate tests and documentation.
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- [x] The pull request introduces no new warnings and follows the
project's style guidelines.

Signed-off-by: burgholzer <[email protected]>

pyproject.toml

@@ -148,10 +148,12 @@ run.omit = [
     '*/_compat/*',
 ]
 report.exclude_also = [
-    '\.\.\.',
-    'if TYPE_CHECKING:',
-    'raise AssertionError',
-    'raise NotImplementedError',
+  '\.\.\.',
+  'if TYPE_CHECKING:',
+  'raise AssertionError',
+  'raise NotImplementedError',
+  'def __dir__()',  # Ignore __dir__ method that exists mainly for better IDE support
+  '@overload'  # Overloads are only for static typing
 ]