chore(test): Remove unused header includes in test files

[KaganCanSit]

Remove header includes that are not directly used in their respective translation units. Identified through manual code review assisted by IWYU (Include What You Use).

I’m not entirely familiar with the project code. For that reason, I’ve stayed out of the include and src directories as much as possible.

I compile, test and format it using the commands below, everything seems to be working fine (All 20 test pass). However, I’ll check it in CI.

rm -rf build
cmake -S . -B build -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DFMT_TEST=ON
cmake --build build
cd build && ctest
clang-format -i test/chrono-test.cc test/format-impl-test.cc test/format-test.cc test/gtest-extra-test.cc test/printf-test.cc test/os-test.cc test/ranges-test.cc test/scan-test.cc test/xchar-test.cc

Note: I labeled this as chore rather than refactor since these changes are closer to maintenance. Happy to update the title or label if you prefer something different.

Please leave a comment if there’s anything you’d like me to adjust. I’ll look into it when I have a chance.

[KaganCanSit]

The clang-format CI check is reporting an error in the include/fmt/base.h file, but this has nothing to do with the changes in this PR. The file was not modified here. (I am currently using clang-format 19.1.7 on the Debian 13 Trixie distribution.)

I’m not entirely sure, but the error might be caused by the Fuzzer project’s default branch name being changed from master to main. -> https://github.com/google/oss-fuzz/blob/master/projects/fmt/Dockerfile

#9 [5/7] RUN git clone --depth 1 --branch master 

[vitaut]

The clang-format issue is fixed in main, you can ignore lint and oss-fuzz failures.

[KaganCanSit]

Thanks for the information. I’ve rebased to the main branch. This should resolve the Clang formatting error. If any other changes wants I'm here.

[vitaut]

Merged, thank you!