Refactor to use common system table and column dropdown

[allisonking]

Closes #879

Code Changes

• Bring ColumnDropdown and SystemsCheckboxTable to this repo
  • Really this should be done via fidesui, but I'm trying to stay unblocked so copied and pasted for now. https://github.com/ethyca/fidesui/pull/27 puts those components in fidesui, but it's awaiting review and some discussion
  • In theory, we should be able to swap the imports after it goes into fidesui and things should Just Work
• Replace old ColumnDropdown component and use the new one (used by DatasetFieldsTable and DatasetCollectionView). These should look and behave the same as before
• Refactor ScanResultsForm to use the new SystemsCheckboxTable. This should also look mostly the same as before
• Adds column selection to the scan results page
• Made some styling changes that became more noticeable when the table was able to change widths (due to choosing fewer columns)

Steps to Confirm

• Turn on the config wizard in flags.json
• Unskip the config wizard tests and go through those, or, if you do have real AWS creds, try those out

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation Updated:
  • documentation complete, or draft/outline provided (tag docs-team to complete/review on this branch)
  • documentation issue created (tag docs-team to complete issue separately)
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md

Description Of Changes

Closely related to https://github.com/ethyca/fidesui/pull/27

Screen.Recording.2022-10-28.at.2.48.12.PM.mov

[allisonking]

Failing cypress tests seem to be a problem on main as well 😕

[LKCSmith]

Looks good to me.