Walk Data Entry - Verification check code optimisation

[andrewvanbreda]

As per email conversation with John...
The species grid on the Walk Data Entry page (https://ukbms.org/input-data) is making a call to check_verification_rules on the Warehouse, but is doing so with a call per species row, rather than as one request with multiple data returned.
Further to this, these calls are asynchronous, and thus hit the server hard as they run in parallel.

1. Change to one request
2. Make sure page displays before checks are complete, then update the page.
   Possibly display "verification checks running…" message with spinner.

David to assign and prioritise

[andrewvanbreda]

@DavidRoy
Just realised I can't assign on this project, I had intended to assign this to you to decide about priority, and who is to deal with this.

[colinharrower]

@andrewvanbreda I've sent an invite to you that should give you the ability to manage issues and assign in this repo

[andrewvanbreda]

Hi @colinharrower
Thank you.
Yes, I can assign issues now.

[andrewvanbreda]

Note:
David has requested the temporary disabling of verification check functionality to improve site speed.
This appears to be controlled by the "Server range validation" checkbox on the data entry page Edit Tab, I have switched this off for now.