Refactor testing harness to use defaults (#808)

* Refactor testing harness to use defaults

- Move tests into defaultly named test folders
- Use default test suffix of ".test" instead of "_test"
- Make cluster-store tests unit tests by adding more
    nesting, so that order of tests doesn't matter

Signed-off-by: Sebastian Malton <sebastian@malton.name>

Co-authored-by: Sebastian Malton <smalton@mirantis.com>

src/renderer/components/+preferences/kubectl-binaries.tsx

@@ -1,6 +1,6 @@
 import React, { useState } from 'react';
 import { Trans } from '@lingui/macro';
-import { isPath } from '../input/input.validators';
+import { isPath } from '../input/input_validators';
 import { Checkbox } from '../checkbox';
 import { Input } from '../input';
 import { SubTitle } from '../layout/sub-title';