Resolve "Show track description in tooltip on hover"

Description

• visualization: track description tooltip
• testdata: add test description to uniprot in track_config_default
• testdata: changed presets to be more realistic

Related issues

Notes to review (code/docs/QA)

Tests

General

• Tests have been added that prove my fix is effective or that my feature works
• Related tests have been modified/removed

Hypothesis testing:

• Soak testing has been done
• Distribution between positive / negative cases has been checked

Database

• Includes changes to database schema
• Includes necessary database migrations

Configuration

• Includes changes to configuration
• Includes configuration migration instructions in documentation

Closes #2141 (closed)