Remove max from row limit setting, combine forms

[dafeder]

This PR consolidates the two datastore settings forms into one, and removes the hard limit imposed by the form on the row count.

QA Steps

• The SQL Endpoint settings link is gone from the admin menu
• The row count limit on the datastore settings menu can be set to 20000
• If the row count field is left blank, it will be set to 500.

[janette]

@dafeder I get an error on the docs page

Fetch error
Bad Request /api/1/metastore/schemas/dataset/items/cedcd327-4e5d-43f9-8eb1-c11850fa7c55/docs

[janette]

Also am allowed to set the limit to anything on the api/1/datastore/sql/?query= endpoint

[dafeder]

It should fail validation if the limit in the query is higher than the max setting

[dafeder]

@dafeder I get an error on the docs page

Fetch error
Bad Request /api/1/metastore/schemas/dataset/items/cedcd327-4e5d-43f9-8eb1-c11850fa7c55/docs

Ok I'll look into this.

[clayliddell]

@janette I wasn't able to replicate the error you observed on my local environment with a Vanilla DKAN instance.

Also I was able to successfully complete the QA Instructions.

[janette]

@dafeder @clayliddell yes, after a fresh build everything is working as expected.