return list of applications based on selected timeframe

[shini4i]

We are returning the complete list of available applications even if these applications were not deployed within the selected timeframe. It is misleading. Let's change it.

[bozerkins]

There are two ways we can implement it. There's a proper way and a hacky way. Since we're planning long term for a proper HA mode and reliable UI, I would go with the first option. @shini4i , @tomsozolins would like to hear your input regarding this.

Option 1 (proper)

Backend changes

We change the tasks API so that it not only has application and timeframe filters, but limit as well. We'll do a backend-based pagination, meaning on every page change we'll be fetching records for that page from the backend.
For the API that returns applications, we would need to introduce timeframe filters.

Frontend change

In Frontend, we'll be doing a query to a database for a proper page on every page change (or filters change).
For the Application filter, we'll do a reload of the list of applications when the timeframe filter changes.

Option 2 (hacky)

Since we're currently loading all the tasks for all the pages in the timeframe, we can fetch distinct applications from the tasks that we receive. It's a very easy way to get the functionality right now, but this would also make the UI page very slow if we have a bigger timeframe and hundreds of deployments daily (thousands of records to render per page).