Update main.tf - adding account_id to policies

[mcaronnewrelic]

adding account_id to policies

Changes

Please provide a brief description of the changes here.

Merge Requirements

For new features contributions please make sure you have completed the following
essential items:

• CHANGELOG.md updated to document new feature additions
• Appropriate documentation updates in the docs
• Appropriate Helm chart updates in the helm-charts

Maintainers will not merge until the above have been completed. If you're unsure
which docs need to be changed ping the
@open-telemetry/demo-approvers.

[CLAassistant]

All committers have signed the CLA.