Add chart: Proportion of contracting processes for buyer with red flags

[sabahfromlondon]

Chart details:

• [ ] Type: 2-Slice Pie Chart
• [ ] Title: Proportion of contracting processes for buyer with red flags
• [ ] Slice A → Proportion contracting processes for buyer that have red flags
• [ ] Slice B → Proportion contracting processes for buyer that have no red flags

[Camilamila]

For values lower than 1000, can we add the actual number (e.g 750), since currently is showing 0.

[vgeryarbc]

Fixed to show whole value.