Select use placeholder

[AngelaZQ1]

Description

Closes #696

Use react-select's placeholder attribute which lets you set placeholder text that is gray instead of black. Replaced noValueOptionLabel with placeholder which also removes the default value option from the list.

Other minor changes:

• Concentrations -> Concentration
• Tweaked colors of select dropdown to match input box

Before:

https://github.com/sandboxnu/graduatenu/assets/92692008/95716e7d-524c-4821-9b9c-6b9dd74c3fcc

After:

https://github.com/sandboxnu/graduatenu/assets/92692008/66f4ec1a-0a29-4799-98ee-6b2777b7aa4f

Type of change

Please tick the boxes that best match your changes.

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [ ] This requires a run of yarn install
• [ ] This has migration changes and requires a run of yarn dev:migration:run

How Has This Been Tested?

Please describe how you tested this PR (both manually and with tests) Provide instructions so we can reproduce.

• [ ] Test A
• [ ] Test B

Checklist:

• [ ] I have run the production builds in docker for the frontend/backend and ensure things run fine. Check README of repo on how to run if not sure.
• [X] I have performed a self-review of my own code
• [X] I have commented my code where needed
• [ ] 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
• [ ] I've run the end to end tests
• [ ] Any dependent changes have been merged and published in downstream modules

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Name	Status	Preview	Comments	Updated (UTC)
graduatenu-frontend-v2	❌ Failed (Inspect)			Feb 8, 2024 11:50pm

[AngelaZQ1]

@BrandonLim8890 im gonna implement disabling the button until all fields are filled out in https://github.com/sandboxnu/graduatenu/pull/704/ since I think it makes more sense there