RHOAIENG-12831: Standardize file selection on pipeline editor

[caponetto]

https://issues.redhat.com/browse/RHOAIENG-12831

Right-click on pipeline editor canvas and select "New node from Pipeline"

Current Behavior	New Behavior
- List only files, not folders - Cannot navigate between folders - List files in the root folder if the pipeline file is in the root folder - List files in the parent folder of the folder where the pipeline file is	- List files and folders - Can navigate between folders - List files in the folder where the pipeline file is

Node Properties panel - Inputs section

Current Behavior	New Behavior
- List only files, not folders - Cannot navigate between folders - When there is a value for the input path, it lists the folder where the given input file path is - When the value is empty, it lists files in the root if the pipeline file is in the root. Otherwise, it lists files in the parent folder of the folder where the pipeline file is	- List files and folders - Can navigate between folders - When there is a value for the input path, the current behavior is kept - When the value is empty, it lists files in the folder where the pipeline file is

Node Properties panel - File Dependencies section

Current Behavior	New Behavior
- List files and folders - Can navigate between folders - When there is a value for the Input path, it lists the folder where the given input file path is - When the input path is empty, it lists files in the root if the pipeline file is in the root. Otherwise, it lists in the parent folder of the folder where the pipeline file is	- List files and folders - Can navigate between folders - When there is a value for the input path, the current behavior is kept - When the value is empty, it lists files in the folder where the pipeline file is