tgc-revival: use the cai asset types in ConverterMap

[zli82016]

It is easier to check if a CAI asset type is supported in cai2hcl or not.

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 1 file changed, 61 insertions(+), 82 deletions(-))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 1 file changed, 61 insertions(+), 61 deletions(-))