Update to "Support" Multiple Custom Multi-Select Filters

[elipe17]

Summary of Changes

• Reverted callback logic since it is not used anymore
• Updated CSS on mulitselect element to allow custom sizing from templates

Pull request closes #_

How to Test

• Checkout 3102-fy-multiselect on the TANF repo.
• Submit some data
• Checkout the new filters and verify functionality

Deliverables

More details on how deliverables herein are assessed included here.

Deliverable 1: Accepted Features

Checklist of ACs:

• [insert ACs here]
• lfrohlich and/or adpennington confirmed that ACs are met.

Deliverable 2: Tested Code

• Are all areas of code introduced in this PR meaningfully tested?
  • If this PR introduces backend code changes, are they meaningfully tested?
  • If this PR introduces frontend code changes, are they meaningfully tested?
• Are code coverage minimums met?
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  • Backend coverage: [insert coverage %] (see CodeCov Report comment in PR)

Deliverable 3: Properly Styled Code

• Are backend code style checks passing on CircleCI?
• Are frontend code style checks passing on CircleCI?
• Are code maintainability principles being followed?

Deliverable 4: Accessible

• Does this PR complete the epic?
• Are links included to any other gov-approved PRs associated with epic?
• Does PR include documentation for Raft's a11y review?
• Did automated and manual testing with iamjolly and ttran-hub using Accessibility Insights reveal any errors introduced in this PR?

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• Was the code successfully deployed via automated CircleCI process to development on Cloud.gov?

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Deliverable 7: Secure

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Deliverable 8: User Research

Research product(s) clearly articulate(s):

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[raftmsohani]

LGTM, but I also questioned in TANF PR why we decided to create the query in template vs doing the query in 508.