POL-1307 Custom Meta Parent Templates / Tag Cardinality Report Fix

[XOmniverse]

Description

Meta Parent Custom Templates

This enables policy templates to use a custom template for meta parent policy generation. To make use of this new functionality, place a .pt.template file in the same directory as the child policy template and put the name of the file in the meta_template field in the info block. For example:

info(
  version: "3.2.0",
  provider: "AWS",
  service: "Tags",
  policy_set: "Tag Cardinality",
  meta_template: "aws_tag_cardinality_meta_parent.pt.template"
)

This will cause the automation that generates meta parent policy templates to use the specified template instead of the default one. The intended use-case here is for policy templates where simply combining incidents results in undesired behavior. An example is with the other change made with this PR.

Tag Cardinality Report Meta Parent Fix

When combining incidents from child policy templates, the meta parent for the Tag Cardinality Report policy templates would list the same key multiple times if it appears in multiple cloud accounts. As a result, it was not actually correctly reporting cardinality and was instead reporting per-account cardinality.

Using the functionality above, these policies now have custom meta parent templates with additional logic to properly combine the incidents into a single, correct cardinality report.

Issues Resolved

In addition to the above, this fixes an issue where the publish flag was incorrectly being used to determine the deprecated flag in meta parent policies. This flag is now correctly aligned with the deprecated flag in the child policy.

Link to Example Applied Policy

Contribution Check List

• New functionality includes testing.
• New functionality has been documented in the README if applicable
• New functionality has been documented in CHANGELOG.MD

[github-actions]

	1 Error
🚫	README_META_POLICIES.md Markdown syntax errors found: README_META_POLICIES.md:186: MD033 Inline HTML README_META_POLICIES.md:186: MD033 Inline HTML Further documentation is available for these failures: MD033: https://github.com/markdownlint/markdownlint/blob/main/docs/RULES.md#md033—inline-html

	2 Warnings
⚠️	operational/aws/tag_cardinality/aws_tag_cardinality.pt Policy template updated but associated README.md file has not been. Please verify that any necessary changes have been made to the README.
⚠️	operational/azure/tag_cardinality/azure_tag_cardinality.pt Policy template updated but associated README.md file has not been. Please verify that any necessary changes have been made to the README.

	1 Message
📖	Github Pull Request Pull Request is missing READY-FOR-REVIEW label. Please add this label if this Pull Request is ready for review. Please note that this message may be a false positive if you've added the label after Dangerfile tests were run, since adding labels does not trigger them to run again. In these cases, simply ignore this message.

Spell Checker found issues

README_META_POLICIES.md

Line	Typo
288	nd the list defined in [tools/meta_parent_policy_compiler/meta_parent_policy_compiler.r
288	s/meta_parent_policy_compiler/meta_parent_policy_compiler.rb](tools/meta_parent_policy_com
290	More information at [tools/meta_parent_policy_compiler/README.md](tools/meta_parent_
290	s/meta_parent_policy_compiler/README.md](tools/meta_parent_policy_com

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