CCM-12224: inline standard lambda policies to reduce policy resource usage

[harrim91]

Description

Replaces managed IAM policy resources with inline policies in Lambda module.

Context

We're hitting IAM Policy resource limits in template-management dev. Looking at some sandbox environments, it looks like each sandbox env has

• 21 lambda functions
• 50 IAM policies

The lambda-related IAM policies in each environment include:

• 18 "main" policies (permissions specific to that lambda)
• 20 "logging" policies (allowing the lambda to write logs)
• 4 "publish" policies (allowing the lambda to publish to SNS when enable_dlq_and_notifications is true)
• 4 "send_message" policies (allowing the lambda to send to SQS DLQ when enable_dlq_and_notifications is true)

This replaces the "logging", "publish" and "send_message" policy resources and adds them as inline policies on the lambda role.

You can have an unlimited number of inline policies up to a total of 10240 characters attached to a role. Here I'm attaching 3 policies, and the total characters will be well under the character limit.

I've left the "main" policy as a managed policy resource as it gives you a 6144 character limit which is separate from the inline limit.

But as an example, this change should reduce the number of IAM policies per templates sandbox environment from 50 to 22.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[aidenvaines-cgi]

Whilst Policy Attachments is prefered over InLine policies this PR drops from 50 to 22 in just the Template Management repo making IAM limits less of a problem