Fixed minor issues into .gitignore amd CMake script (GONG-402 prerequisite)

This is small fix which improves existing sources

Type of change

• Bug Fix
• Feature

Does this introduce a change in the core logic?

• [NO]

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Does this introduce a breaking change?

• [NO]

What is the current behavior?

1. After project is opened by VSCode .vscode directory is visible in changelist
2. A piece of code from google-cloud-cpp sources was introduced directly into IOManagerGoogle.cpp

What is the new/expected behavior?

1. After project is opened by VSCode .vscode directory isn't visible in changelist
2. The original google-cloud-cpp sources was referenced and used

Have you added/updated Unit Tests and Integration Tests?

• [NO]

Changes:

• Global .gitignore is updated to hide VSCode directory
• The original google-cloud-cpp sources was referenced and used instead of adding piece of then directly into IOManagerGoogle.cpp