Custom rate and named standard rate for units (Issue #1216)

[gyordong]

Description

This PR adds a custom rate box for unit creation and edit.

Fixes #1216

Type of change

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

Checklist

• [X ] I have followed the OED pull request ideas
• [X ] I have removed text in ( ) from the issue request
• [X ] 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]

@gyordong I started to review this PR and found changes that don't seem related to the work done. I looked into this and found that previously merged changes seem to be gone in several files. One example is processData.js (line 787-8). Did you have merge conflicts when you brought in development? I see a commit with the msg "fixing mrge" on 11/15/24 but did not easily determine that is where the change happened. The bottom line is I'm nervous about these changes and what may now be out of sync with development. I think this needs to be resolved carefully (and let me know if you think I am wrong about this). If we should discuss more then please let me know.