fix(terraform_plan): Fix parsing other types of provisioners

[tsmithv11]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Description

The parser was causing errors for provisioners that weren't local-exec. This fixes: #5622 (comment)

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes

[junhu73]

Thanks. Just FYI, don't think it is due to your feature. The same terraform plan file trigged this bug on ubuntu, but didn't get triggered on Mac OS (seems on the Mac, it only processes one of local-exec provisioners resources, it didn't process all the local-exec resources and remote-exec/file provisioners).