New PR due to merge
conflicts(https://github.com/openvinotoolkit/openvino/pull/22917)
Updated the copyright year from 2018-2023 to 2018-2024 in all openvino
files
Ref. to script: CVS-101144
Command used:
```bash
git grep -lz '2018-2023 Intel Corporation' | xargs -0 sed -i '' -e 's/2018-2023 Intel Corporation/2018-2024 Intel Corporation/g'
```
* Copied PR6744
* Added CMakeLists.txt into gflags
* Return gflags into .gitmodules
* Added CMakeLists.txt into gtest
* fix: remove extra gflags and gtests from .gitmodules
* Change syntax in set gtest_targets
* Make gtest/CMakeLists.txt as in PR6744 for pre-commit experiment
* Update gtest/CMakeLists.txt
* Change version of gtest repo
* Return gtest info into .gitmodules
* Update gflags version to currently used
Jacek Pawlak