Change 'testFiles' to 'specPattern'

[awirl-foreflight]

Describe the bug
Cypress has depreciated the testFiles command and we need to change that syntax to the new specPattern syntax

To Reproduce
Steps to reproduce the behavior:

1. Open a Cypress file
2. View a test
3. Click the Open Cypress link

After going through the menus - observe that the files never load

Expected behavior
The test file should load

Environment (please complete the following information):

• Extension version: 2.4.0
• VS Code version: 1.67.2
• OS: Mac 12.4 (21F79)

** Developer Tools Console Output **

Additional context
Add any other context about the problem here.