Add a coverage reporters option to ng test and angular json test options

### Command

test

### Description

It would be nice to be able to specify coverageReporters similar to reporters for ng test

### Describe the solution you'd like

ng test --code-coverage --coverage-reporters lcov

### Describe alternatives you've considered

I could just add a karma conf and configure the coverage reports there, but I can configure excludes for code coverage, why not the reporter?

Start with the ng test command and its angular.json test options, then compare the existing reporters option with the requested coverageReporters behavior. Check how --code-coverage and Karma configuration currently handle coverage; done means ng test --code-coverage --coverage-reporters lcov selects the requested reporter and the equivalent angular.json option works.

Written by the indexing model from the issue text.