Fix rule merging

[dubiousdavid]

The following doesn't work as _.extend only accepts two args when using lodash/fp:

rules: _.extend(
    eslintBuiltinRules,
    reactRules,
    lodashFpRules,
    lodashRules,
    importRules,
    mochaRules,
    jestRules
  )

The fix is to do:

_.mergeAll(
[
    eslintBuiltinRules,
    reactRules,
    lodashFpRules,
    lodashRules,
    importRules,
    mochaRules,
    jestRules
]
  )

However, this could be dangerous because there are a ton of rules not currently being applied that could cause things to break.

[rudolph9]

It looks like this got adjusted in August to use _.extendAll (and later tweaked to pass it an array).

@daedalus28 are you still seeing issues here? Perhaps this is fixed and the ticket never got closed.

[rudolph9]

Looks like we never updated spark to the latest version with this issue fixed https://github.com/smartprocure/spark/pull/8522