pantsbuild / pants / 34637

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Improve error message for unrecognized BUILD file symbols (#10531)

Closes https://github.com/pantsbuild/pants/issues/10310.

Before:
```
▶ ./pants list src/python/pants/util --no-pantsd --no-print-exception-stacktrace
01:04:10 [ERROR] 1 Exception encountered:

  MappingError: Failed to parse src/python/pants/util/BUILD:
NameError("name 'fake' is not defined",)
```

After:

```
▶ ./pants list src/python/pants/util --no-pantsd --no-print-exception-stacktrace
01:02:43 [ERROR] 1 Exception encountered:

  MappingError: Failed to parse src/python/pants/util/BUILD:
Name 'fake' is not defined.

All registered symbols: ['_python_requirements_file', 'files', 'pants_requirement', 'pants_setup_py', 'python_artifact', 'python_binary', 'python_integration_tests', 'python_library', 'python_requirement', 'python_requirement_library', 'python_requirements', 'python_tests', 'resources', 'setup_py', 'target']

```

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