Fix exportloopref Linting Issues and Enable in CI Testing

[bflad]

Description

exportloopref finds exporting pointers for loop variables.

$ golangci-lint --max-issues-per-linter 0 --enable exportloopref run ./aws
aws/resource_aws_glue_dev_endpoint.go:415:37: exporting a pointer for the loop variable k (exportloopref)
			removeKeys = append(removeKeys, &k)
			                                 ^
aws/resource_aws_proxy_protocol_policy.go:214:39: exporting a pointer for the loop variable policy (exportloopref)
			newPolicies = append(newPolicies, &policy)
			                                   ^
aws/resource_aws_proxy_protocol_policy.go:240:40: exporting a pointer for the loop variable p (exportloopref)
				newPolicies = append(newPolicies, &p)
				                                   ^

Definition of Done

• Fix existing exportloopref reports
• Add exportloopref to .golangci.yml and ensure CI passes

References

• Adding multiple tags to a cloudHSM cluster does not work #9871
• Small change to fix bug where only 1 tag would be created when multiple specified #9741

[bflad]

Updating for exportloopref due to golangci/golangci-lint#1041

[github-actions]

This functionality has been released in v4.14.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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