fix(util-endpoints): check for entire resource-path being empty

[trivikr]

Issue

Refs: #6379 (comment)

Description

Check for entire resource-path being empty when parsing Arn

Testing

Unit and Endpoint tests are successful

$ yarn jest -c tests/endpoints-2.0/jest.config.js tests/endpoints-2.0/endpoints-integration.spec.ts
...
Test Suites: 1 passed, 1 total
Tests:       14672 passed, 14672 total

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[gosar]

Ok to ship this to unblock failing test, but follow up on expected behavior for case like arn:aws:s3:us-west-2:123456789012:my:folder/my:file

[trivikr]

follow up on expected behavior for case like arn:aws:s3:us-west-2:123456789012:my:folder/my:file

PR #6387

[github-actions]

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