Add Terrascan to CI - CORE-1371

[arsci]

Description

Add Terrascan to CI

CI Output

TODOs

Read the Gruntwork contribution guidelines.

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes

Added Terrascan to CI

[gruntwork-ci]

Upgrade test results for build 689

• Modules upgraded from origin/HEAD => add-terrascan-ci/CORE-1371
• Terraform upgraded from latest:^1.2 => latest:^1.3

⚠️ If plan results are not all 0's, review the plan output to ensure backward compatibility.

Example	Modules to upgrade	Plan	Upgraded?	Patched	Upgraded?
join-path	instance-type join-path	0, 0, 0	✅
instance-type	instance-type join-path	0, 0, 0	✅

[gruntwork-ci]

Upgrade test results for build 696

• Modules upgraded from origin/HEAD => add-terrascan-ci/CORE-1371
• Terraform upgraded from latest:^1.2 => latest:^1.3

⚠️ If plan results are not all 0's, review the plan output to ensure backward compatibility.

Example	Modules to upgrade	Plan	Upgraded?	Patched	Upgraded?
join-path	instance-type join-path	0, 0, 0	✅
instance-type	instance-type join-path	0, 0, 0	✅

[gruntwork-ci]

Upgrade test results for build 702

• Modules upgraded from origin/HEAD => add-terrascan-ci/CORE-1371
• Terraform upgraded from latest:^1.2 => latest:^1.3

⚠️ If plan results are not all 0's, review the plan output to ensure backward compatibility.

Example	Modules to upgrade	Plan	Upgraded?	Patched	Upgraded?
join-path	instance-type join-path	0, 0, 0	✅
instance-type	instance-type join-path	0, 0, 0	✅

[gruntwork-ci]

Upgrade test results for build 715

• Modules upgraded from origin/HEAD => add-terrascan-ci/CORE-1371
• Terraform upgraded from latest:^1.2 => latest:^1.3

⚠️ If plan results are not all 0's, review the plan output to ensure backward compatibility.

Example	Modules to upgrade	Plan	Upgraded?	Patched	Upgraded?
join-path	instance-type join-path	0, 0, 0	✅
instance-type	instance-type join-path	0, 0, 0	✅