fix(lanelet2_map_validator): change validation order in regulatory_elements_details

[TaikiYamada4]

Description

This PR changes the order of validation in regulatory_elements_details.
The validator will first check whether there are empty attributes, and then will check the type of them are valid.

Thanks to this change the validator will NOT output two issues when the attribute type is wrong.

Related links

This bug was found through this PR #150.
Because the PR above cannot pass the colcon test in the CI, this PR has to go first.

Tests performed

Test the codes through

colcon test --event-handlers console_cohesion+ --packages-select autoware_lanelet2_map_validator

Notes for reviewers

Note that this change is mainly aimed to fix the bug found in the test made in PR #150.
I had to change test_regulatory_element_details.cpp too due to the changes in regulatory_element_details_for_traffic_lights.cpp and regulatory_element_details_for_crosswalks.cpp, but test_regulatory_element_details.cpp will be removed soon in PR #150.

Interface changes

None

Effects on system behavior

Since the validation changed, no redundant issues of "missing refers" will be gone when the refers type is only wrong.

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