Add Snyk and White-source scanning on our repo

[steven0711dong]

Problem
We see some dependencies that are considered as vulnerable by both Snyk and White-source scanning. I found out about this because our organization does the scanning after we clone the repo. Keda does both snyk and white-source scanning so I would like to propose that we enabled these 2 scans on this repo as well so that any vulnerable libraries could be caught on PR and people no longer open git issues on vulnerable libraries and users that have dependency on this repo do not have to patch the vulnerable libraries themselves.

Persona:
Which persona is this feature for?

Exit Criteria
A measurable (binary) test that would indicate that the problem has been resolved.

Time Estimate (optional):
How many developer-days do you think this may take to resolve?

Additional context (optional)
Add any other context about the feature request here.

[krsna-m]

Please close this issue and re-open it in the test-infra repo so we can track it here 🙏

[steven0711dong]

Closing this issue due to no responses. Re-opening in knative/test-infra#3135