Tasks can be completed after resolution

[kennsippell]

Describe the bug
Eager users can complete resolved tasks again before the task disappears from the UI.
This can cause strange outcomes for workflows and oddities in data.

To Reproduce

1. Navigate to tasks tab
2. Open a task
3. Fill in the form. You are now ready to submit the form and resolve the task
4. Click Submit and quickly click on the task you just completed

Expected behavior
Users should not be able to complete tasks multiple times
Observed behavior: this user has resolved the task but also has the UI open to complete ita gain

Environment

• Instance: Nairobi eCHIS
• App: webapp
• Version: 4.13

Example reports completed from same task:
https://nairobi.echis.go.ke/#/reports/3fc1bc12-be55-4b53-9bb6-a6c94a7b0963
https://nairobi.echis.go.ke/#/reports/8a0562d3-981b-417d-a801-417108466fab

[korirm]

@dianabarsan, we have seen this behavior in the current payroll generation for Nairobi. We request prioritization of this fix as we are in a scale-up phase of the project; more users will be onboarded to use eCHIS for their stipend payments.

[dianabarsan]

I think hiding the task list immediately after task submission - showing a loader instead of the task list - is probably the easiest way to work around this.