Fix selenium issues when running two rabbitmq (backport #13868)

[mergify]

Proposed Changes

Exclude other_rabbitmq when running start-others. And fix some other issues.

Types of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply

• Bug fix (non-breaking change which fixes issue #NNNN)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause an observable behavior change in existing systems)
• Documentation improvements (corrections, new content, etc)
• Cosmetic change (whitespace, formatting, etc)
• Build system and/or CI

---

This is an automatic backport of pull request #13868 done by [Mergify](https://mergify.com).