[20523] Improve IDL parser tests

[MiguelCompany]

Description

This is a follow-up of #4943 that fixes a typo, and also makes cmake generation fail if the submodule with the test IDLs has not been initialized.

Depends on:

• [22596] Update submodules when cloning Fast DDS on CI #5558

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• 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.
• N/A: Any new configuration API has an equivalent XML API (with the corresponding XSD extension)
• Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• 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.
• N/A If this is a critical bug fix, backports to the critical-only supported branches have been requested.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[juanlofer-eprosima]

LGTM, but could you please also address the following change?

In Ubuntu 24 the following warning is being thrown:

/root/workspace/Fast-DDS/src/fastdds/src/cpp/fastdds/xtypes/dynamic_types/idl_parser/IdlPreprocessor.hpp:187:48: error: ignoring attributes on template argument ‘int (*)(FILE*)’ [-Werror=ignored-attributes]
  187 |         std::unique_ptr<FILE, decltype(&pclose)> pipe(

I tested the following solutions:

Explicit deleter:

using PipeDeleter = int (*)(FILE*);
std::unique_ptr<FILE, PipeDeleter> pipe(
    popen(cmd.c_str(), EPROSIMA_PLATFORM_PIPE_OPEN_FLAGS), pclose);

Lambda:

std::unique_ptr<FILE, std::function<void(FILE*)>> pipe(
    popen(cmd.c_str(), EPROSIMA_PLATFORM_PIPE_OPEN_FLAGS), 
    [](FILE* f) { pclose(f); }
);

[MiguelCompany]

I followed a modified version of the lambda approach in cd64d1e

[juanlofer-eprosima]

LGTM