Add chart: Collusion red flags frequency

[sabahfromlondon]

Chart details:

• [ ] Type: Horizontal bar chart
• [ ] Title: Collusion red flags frequency
• [ ] Description: Identify which collusion red flags are most prevalent.
• [ ] X-axis → Number of contracting processes flagged
• [ ] Y-axis → Red flag name

[sabahfromlondon]

@Camilamila the x-axis label is likely to be too long. Perhaps we can change to:

"Contracting processes with ‘collusion’ red flags"

[Camilamila]

Updated!