FFT-80 Payroll override edit forecast

[CaitBarnard]

If payroll data exists for any row in the forecast table then these values can viewed instead of the default forecast values via a toggle.

Current bugs:

• Turn on payroll rows, then edit a cell (so that it becomes blue), then turn off the toggle. The edited cell should reset but on a refresh the updated value is actually persisted.

Notes:

• Needs to be tested with realistic data to confirm decimals are displayed and rounded correctly

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• JIRA ticket referenced in title
• Title is clear and concise
• Description gives any relevant detail
• Tests are up to date
• Documentation is up to date

[SamDudley]

Lot's of great work here! I've made a few suggestions. Happy to chat through them on a call.