Refactor vertical-temperature-slider Test Plan to V2 Test Format

[IsaDC]

Preview Tests

• Convert test plan to v2
• Remove previous csv files
• Update references in assertions.csv
• Update priority to Must for assertions that do not convey numeric values
• Add interactionModeEnabled assertion to tests.csv for JAWS and NVDA

[IsaDC]

@mcking65 ready for review.