Chore: Move workfile utils functions to workfile pipeline code

[iLLiCiTiT]

Changelog Description

Moved should_start_last_workfile and should_workfile_tool_start from applications logic to workfile pipeline code.

Additional info

Both functions are pipeline related, are using core settings and should be available from anywhere. Because applications logic will be separate into addon this is the ideal change.

Testing notes:

1. Last workfiles should be opened correctly.
2. Showing of workfiles tool on startup should work too (not sure for which host integrations it really works?).

[kalisp]

Works.

Out of curiosity, what parts will stay in ayon-core and what parts will go to ayon-applications (assuming applications.py would go)

[iLLiCiTiT]

Out of curiosity, what parts will stay in ayon-core and what parts will go to ayon-applications (assuming applications.py would go)

Only applications.py and some cli (extractenvironments).