Updated 'Add Vehicle' button

[devin-aot]

Description

Updated 'Add Vehicle' button to have a dropdown for PowerUnits and Trailers

Did not implement functionality for showing a Trailer form,

Used code from: https://mui.com/material-ui/react-menu/#menulist-composition

Modified the z-index of menulist

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• npm start
• click 'Add Vehicle' -> click 'Add PowerUnit' (form should show)

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

Further comments

---

Thanks for the PR!

Any successful deployments (not always required) will be available below.
Backend - Vehicles available
Frontend available

Once merged, code will be promoted and handed off to following workflow run.
Main Merge Workflow

[krishnan-aot]

+1

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
4 Code Smells

No Coverage information
0.0% Duplication