Avoid using-directives in the global scope in headers

[vkucera]

Using-directives should never appear in the global scope in headers because they irreversibly pollute the global namespace wherever they are included and can lead to unexpected behaviour, such as name conflicts. See O2 CodingGuidelines, C++ Core Guidelines.

[vkucera]

Fixed non-PWG directories

• Remove using-directives from common headers #3324

[vkucera]

• Fix namespace pollution from std and o2::constants #3423
• Fix namespace pollution from std and o2::constants AliceO2#11851

[vkucera]

• PWGHF: Avoid using-directives in headers #3617

[vkucera]

Test implemented in:

• [Infrastructure] Add O2 linter #7066