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 (2b2db9c) 77.91% compared to head (1384b93) 77.91%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #588 +/- ## ======================================= Coverage 77.91% 77.91% ======================================= Files 140 140 Lines 7766 7766 ======================================= Hits 6051 6051 Misses 1715 1715 ```

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