feat(cli): make resourcename optional for run command

[schoren]

This PR updates CLI to allow running tests and testsuites without having to specify the resourceName as an argument.

For example:

tractest run -f ./test-suite.yaml # this works
tractest run -f ./single-test.yaml # this works

tractest run testsuite -f ./single-test.yaml # this will not pass validation
tractest run test -f ./test-suite.yaml # this will not pass validation

tractest run testsuite -f ./test-suite.yaml # this still works
tractest run test -f ./single-test.yaml # this  still works

Changes

Fixes

Checklist

• tested locally
• added new dependencies
• updated the docs
• added a test

Loom video

https://www.loom.com/share/6eb5a28ff0024cb2a28edc46d8e140d3