Remove HIDE_SYMBOLS_BY_DEFAULT: replace by a default configuration in gz-cmake.

[j-rivero]

See https://github.com/gazebosim/gz-cmake/issues/166

[codecov[bot]]

Codecov Report

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

Comparison is base (c93aab8) 97.41% compared to head (560d552) 97.41%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #413 +/- ## ======================================= Coverage 97.41% 97.41% ======================================= Files 27 27 Lines 1201 1201 ======================================= Hits 1170 1170 Misses 31 31 ```

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