cnvm: include full ec2 instance id in findings fields

[orouz]

Summary of your changes

for ec2 instances, return the full id, including the i- prefix

Screenshot/Data

before	after

Related Issues

• fixes cloud.instance.id and resource.id missing i- prefix for CNVM #2645

[mergify]

This pull request does not have a backport label. Could you fix it @orouz? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit
  NOTE: backport-v8.x has been added to help with the transition to the new branch 8.x.