Fix restart parsing of file name (backport of #2792 and #2793)

[andrew-platt]

Ready to merge

Feature or improvement description
PR #2792 fixed a parsing issue with restarts in the cpp interface. That PR will be included in 4.1, but since we are doing a 4.0.5 release, we might as well backport it.

Related issue, if one exists
See #2792 for details.
Also includes #2793 (fix possible memory leak)

Impacted areas of the software
CPP interface restarts only

Test results, if applicable
None.

[Copilot]

Pull Request Overview

This PR backports a fix to the parsing of the restart file name in the CPP interface from PR #2792.

• Introduces dynamic allocation for out_file_root using malloc.
• Adds error checking after reading the attribute and ensures proper string termination.

Comments suppressed due to low confidence (1)

glue-codes/openfast-cpp/src/OpenFAST.cpp:106

• Dynamically allocated memory in tmpOutFileRoot is not freed after assignment, which may lead to a memory leak. Consider using a smart pointer or explicitly calling free(tmpOutFileRoot) after the assignment.

turbineData[iTurbLoc].outFileRoot.assign(tmpOutFileRoot);

[Copilot]

Pull Request Overview

This PR backports fixes for restart file name parsing and a potential memory leak in the C++ interface.

• Replace fixed-size char array with dynamic allocation for retrieving "out_file_root".
• Ensure proper error checking and memory deallocation for dynamically allocated buffer.

[andrew-platt]

Based on suggestion from @copilot, backported the memory leak fix of #2793 as well.