Allow users to pin custom NCJ templates

**Description**
As I have finally got custom batch images working with SES, it necessitated the use of custom templates. I have noticed that it is quite inconvenient to have to re-select the JSON file every time I want to run my custom Maya / Arnold template, and it would be nice to be able to pin templates into the "Local Templates" screen.

There is a lot of wasted space there so having a few tiles with the JSON file's name displayed (or if you're feeling fancy, maybe add another templateMetadata field like "templateName" that we could display the name in addition to the description) would be a plus to the UX, in my opinion.

Of course there is already the "Recent" list of templates that have been used, however it has a max length of 10 and keeps all the data pre-populated which can be a negative point.

I was thinking about something like this:

Edit: Perhaps the ability to even choose to pin the templates on the main Gallery page could be useful.