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## Current Behavior
The syntax to test a single file is different when using the jest
executor versus the jest cli
```sh
jest <file>
# vs
nx test project --testFile <file>
```
## Expected Behavior
I would expect the jest executor to support a single positional argument
as well
```sh
nx test project <file>
```
This is one of the common questions/complaints that I hear from
developers when transitioning from our standalone apps to our monorepo
This change supports both syntaxes so that this is not a breaking change
and prints a warning when both are used
b224e7c732