new rule request: valid-each

[benmonro]

when using a describe.each or test.each it would be nice to have a rule to ensure that the pretty formatting or $variable injection is used to ensure the results are unique.

for example, rule would report on
test.each([1,2,3])("Should square the number", () => {...})

but not report on

test.each([1,2,3])("Should square %i", () => {...})

[G-Rath]

Closing as a duplicate of #359