[Dashboard]Show relevant datasets ONLY in native filter dataset select

[junlincc]

Dashboard native filter enhancement

Must have -In Datasource field, user should only see the list of datasets that are relevant (being used on the charts in dashboard) in select dropdown.

Should have - add sort to value list to reach feature parity
Nice to have - If all charts use the same dataset, preselect the one for user.

To do:

1. change label "Datasource" to "Dataset"
2. set Allow multiple selections by default

Screen.Recording.2021-03-09.at.12.54.39.PM.mov

[junlincc]

@simcha90 Hey Simcha, we would really appreciate if you can help adding a couple of above features.
Priority : Sort, default for multi select, narrow down relevant option list. 🙏

cc @amitmiran137 @villebro

[villebro]

Closing as this was tackled by #14374