Explicitly check hook signature

[philippjfr]

Ensure we do not mask hook errors (as seen in https://github.com/holoviz/panel/issues/7438) due to handling hook signature fallback using try/except.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.38%. Comparing base (b597638) to head (a24dac7). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7502 +/- ## ======================================= Coverage 82.37% 82.38% ======================================= Files 339 339 Lines 50995 50995 ======================================= + Hits 42008 42011 +3 + Misses 8987 8984 -3 ```

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