fix: Currency report generation

[GSVarsha]

• Fix Successful taskrun filter condition. Current condition doesn't return successful taskruns.

conditions:
  - lastTransitionTime: "2019-08-12T18:22:57Z"
    message: All Steps have completed executing
    reason: Succeeded
    status: "True"
    type: Succeeded

type: "Succeeded", status: "False" → failed (e.g., "step-unittest" exited with code 1)
type: "Succeeded", status: "True" → succeeded (e.g., All Steps have completed executing)

• Return days behind in int instead of timedelta

Package name	Support Policy	Beta version	Last Supported Version	Latest version	Up-to-date	Release date	Latest Version Published At	Days behind	Cloud Native
FastAPI	45-days	No	0.124.2	0.124.4	No	2025-12-12	2025-12-10	5 days, 17:26:54.833221 day/s	No
Urllib3	45-days	No	2.6.1	2.6.2	No	2025-12-11	2025-12-08	7 days, 17:26:56.997257 day/s	No

[CagriYonca]

Looks good to me!