fix(compass-schema-validation): prevent losing changes in validation editor COMPASS-9003

[paula-stacho]

Description

I noticed that we have a mechanism for closing tab with unsaved changes - I figure the validation editor could benefit from it.

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added
• I have signed the MongoDB Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)

Motivation and Context

• Bugfix
• New feature
• Dependency update
• Misc

Open Questions

Dependents

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)

[lerouxb]

The PR title goes in the release notes, so maybe it should make it clear that this helps prevent the user losing their changes? I interpreted it inverted the first time I read it.