Fix select menu being cut off by edges of modals

[jpople]

Closes #PROD-1896

Description Of Changes

Fixed an issue where select dropdown menus were being cut off by the edges of modals.

This changes the position property of all the selects across the app; I audited to make sure it wasn't causing problems anywhere else though.

Code Changes

• Give CustomSelect components a menuPosition of fixed by default
• Remove ConsentMechanismForm component that wasn't being used anywhere in the UI (this should have been removed with the privacy notice form rework but was overlooked)

Steps to Confirm

• Navigate to /consent/configure/
• Click "add vendor" and select a data use and detailed data use
• Verify options in select dropdown are all visible and can be clicked

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Issue Requirements are Met
• Update CHANGELOG.md

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
fides-plus-nightly	⬜️ Ignored (Inspect)	Visit Preview		Mar 28, 2024 6:37pm

[gilluminate]

Tested locally and looking better.

[cypress]

Passing run #6945 ↗︎

0	4	0	0	0
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Details:

Merge a4e101c into fa8bcfe...
Project: fides	Commit: 2221db467f ℹ️
Status: Passed	Duration: 00:33 💡
Started: Mar 28, 2024 6:48 PM	Ended: Mar 28, 2024 6:49 PM

Review all test suite changes for PR #4757 ↗︎