Remove isolated option while adding sys.path

[shatakshiiii]

This PR validates the usage of isolated while adding sys.path to collections path.

Closes: #324

[ssbarnea]

We do not want to lower the code coverage, removing of the test is a very bad idea and coverage was there to remind us not to make this mistake.

The correct solution for this is to modify the tests to check for the new behavior instead of removing them.

[cidrblock]

Removing the conditional allows the number of tests to be dropped. As time permits, please add a test or 2 in a seperate PR to return coverage to it's previous value or higher.

[shatakshiiii]

@ssbarnea ^^^ Also I realized that the changes in this PR is not responsible for lowering the code coverage, as I can see same codecov failure in other open PRs as well. And dropping some unnecessary tests is suppose to happen as per these code changes.