Delete units

[sparakala21]

Description

I added the handleDelete function in EditUnitModalComponent.tsx so that admins can delete units when it is necessary. I also added a way to ensure safety when an admin changes a meters intrinsic properties. (Please include a summary of the change and which issue is touched on. Please also include relevant motivation and context.)

Fixes #1020 and Fixes #1042.

Type of change

• [ ] Note merging this changes the database configuration.
• [x] This change requires a documentation update

Checklist

• [ ] I have followed the OED pull request ideas
• [ ] I have removed text in ( ) from the issue request
• [ ] You acknowledge that every person contributing to this work has signed the OED Contributing License Agreement and each author is listed in the Description section.

Limitations

[huss]

@sparakala21 I could not easily separate out the changes I had tried so I decided to push then out to the PR. There are some comments about open items. Feel free to change my code as needed and to address the items left. Let me know if I can help and thanks for looking into this.

[huss]

I just wanted to document that this PR is waiting on PR #1113 since it changes how Redux state is accessed. After that, this work will be updated and all concerns addressed.

[huss]

I updated the PR to merge in #1113 and edited so uses the Redux Toolkit. I also made all the other needed changes to it works as desired. It should be ready to merge.