[Stabilization] OCP Update variable filter to consider go_template

[yuumasato]

Description:

• Update the variable filter to find if a rule is using go-template, if so find any var being used, add them to var list for that rule
  • Backport of OCP Update variable filter to consider go_template #11906

Rationale:

• Let's ensure that released OCP content works.
  Without this the Compliance Operator fatal errors when scanning with a rule whose variable is not included.

Review Hints:

• Build before and after and check the count difference in XCCDF Variables included.
  grep -r "Value.*id=" /tmp/ssg-ocp4-ds.xml

• Check whether the Variable hypershift_cluster is in the data stream.

[github-actions]

Start a new ephemeral environment with changes proposed in this pull request:

Fedora Environment

Oracle Linux 8 Environment

[github-actions]

🤖 A k8s content image for this PR is available at:
ghcr.io/complianceascode/k8scontent:11955
This image was built from commit: e93e630

Click here to see how to deploy it

If you alread have Compliance Operator deployed:
utils/build_ds_container.py -i ghcr.io/complianceascode/k8scontent:11955

Otherwise deploy the content and operator together by checking out ComplianceAsCode/compliance-operator and:
CONTENT_IMAGE=ghcr.io/complianceascode/k8scontent:11955 make deploy-local

[Honny1]

LGTM