Change credscan to use v3 and enable scan entire repo

[sima-zhu]

The PR is to fix the version issue.
Aggregate-report currently using V3 which reports less errors than v2.
We clean up the errors based v3 instead of v2.
We will use V3 for all pipelines as aggregate-report runs into OOM issue using v2.
Also, make changes to support the entire repo scanning.

[azure-sdk]

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[azure-sdk]

The following pipelines have been queued for testing:
java - template
java - template - tests
js - template
net - template
net - template - tests
python - template
python - template - tests
You can sign off on the approval gate to test the release stage of each pipeline.
See eng/common workflow

[azure-sdk]

The following pipelines have been queued for testing:
java - template
java - template - tests
js - template
net - template
net - template - tests
python - template
python - template - tests
You can sign off on the approval gate to test the release stage of each pipeline.
See eng/common workflow

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