Deprecate TransformTestSelectorParamsToHashPairs transform

As discussed in #149 doesn’t work reliably in all supported version of Ember, if it breaks results in very cryptic error messages and is really a small convenience feature anyway as you can always do

{{foo-component data-test-foo=true}}

instead of

{{foo-component data-test-foo}}

anyway.

[Turbo87]

https://github.com/simplabs/ember-test-selectors-params-codemod ✨

[marcoow]

I think this is similar to the testSelector helper that we had - it adds complexity for very little value.