Fixed search issue - always return all records

[chuanlin2018]

Original ticket: https://sgitlab.nist.gov/oar-odd/science-data-portal/-/issues/13

Fixes:

1. When the search box on focus, select all. This will avoid the leading space.
2. Disabled one search function in field watch function in filters component which is not necessary.
3. Moved one search function from field watch function to ngOnInit in results component.
4. Moved toFieldItems() function from searchfields-list service to advanced search component. This fixed a new problem I discovered: Customize View dropdown missing fields.
5. Fixed unit test.

Should only see three queries when user do a search: one for field list, one for filters and one for result page.

To test it locally, run npm start.

[RayPlante]

Tested this under oar-docker locally. Confirmed that we have eliminated unnecessary queries to the RMM, and searches from various origins result in appropriate matches, including from:

• search box on home page
• search box on results page
• advanced search
• clicking on topic area box on home page