selecting models by name when the name contains quotes now works

[gjesse]

Original issue: model selectors that include quoted identifiers (e.g., --select-model "'gcp-project'.dataset.table") would fail to match both the exact selector and wildcard variants, because the selector parser/matcher mishandled the quotes in the model name.

• Normalized wildcard matching by stripping surrounding identifier quotes on both the selector pattern and model names before fnmatch, allowing mixed quote styles to match consistently (sqlmesh/core/selector.py).
• Added regression tests covering single-quote, double-quote, and backtick patterns and wildcard matching across quote styles (tests/core/test_selector_quoted_wildcard.py).