refactor(compass-connections): remove extra save on connect

[paula-stacho]

Description

In multiple connections, we've been saving the connection twice when 'Connect' was pressed. The first happened alongside connecting, the other - after connection success - was due to unnoticed default shouldSaveConnection in the connect method (used by single connections).
This PR is removing the default 'true'. The parameter is also marked for the cleanup after multiple connections become the norm.

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)