fix: Add s3 principal to iam policy attached to sqs in lambda-promtail terraform code

[mwimpelberg28]

What this PR does / why we need it:
This PR adds a necessary block to the JSON for the SQS queue's IAM policy. Without the principal block, this error is thrown and the code fails.

Error: creating S3 Bucket (mattw-promtail-bucket) Notification: operation error S3: PutBucketNotificationConfiguration, https response error StatusCode: 400, RequestID: Q98D335K5EG1AN2T, HostID: qfu+BijCmGektcXaonVEkmuVCHP9BSqCGOMsRny3N1evFCeN17CuJ1+dB83fGPm4rAJJIuiU8REDr6gM//hLUUEdGrM322+h, api error InvalidArgument: Unable to validate the following destination configurations

Which issue(s) this PR fixes:
Fixes #14618

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[CLAassistant]

All committers have signed the CLA.

[JordanRushing]

LGTM