Description

This PR is a backport combining:

• [20592] Fix hidden overloaded virtual methods #4516
• [20679] Run Github Ubuntu CI on PRs #4598

Before this PR, compiling with GCC option -Woverloaded-virtual resulted in compilation warnings due to overloaded virtual methods being hidden in derived classes that do not override all the parent's overloads. This PR:

1. Fixes all those warnings
2. Adds more warning reporting options GCC in Ubuntu CI on Github
3. Enables running Github Ubuntu CI on pull_request events
4. Enables running Github CI on PRs targeting intermediate branches

It substitutes:

• [20592] Fix hidden overloaded virtual methods (backport #4516) #4592
• [20679] Run Github Ubuntu CI on PRs (backport #4598) #4601

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• N/A: Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• N/A: Any new/modified methods have been properly documented using Doxygen.
• Changes are ABI compatible.
• Changes are API compatible.
• N/A: New feature has been added to the versions.md file (if applicable).
• N/A: New feature has been documented/Current behavior is correctly described in the documentation.
• N/A: Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.