Started refactoring modal to only send emails based on updated fields

[sahalliburton]

Resolves #14730

Description

Updates virtual hearing modal to display differently based on Video or Central hearing as well as whether the user is editing Hearing Time, Timezone, or either POA/Representative Email or Appellant email.

Acceptance Criteria

• Code compiles correctly

Testing Plan

Hearing Time

1. Shadow user BVASYELLOW
2. Navigate to the hearing schedule and choose a 'Central' hearing
3. Click the 'Edit Hearing Details' link and change to a 'Virtual' hearing
4. Navigate back to the daily docket and change the hearing time for this hearing
5. Ensure that the UI matches the figma mockup and that confirming the change triggers a UI alert

Timezone/Email

1. Shadow user BVASYELLOW
2. Navigate to the hearing schedule and choose a 'Central' hearing
3. Click the 'Edit Hearing Details' link and change to a 'Virtual' hearing
4. Change either the timezone or the email for either the appellant or the POA/Representative
5. Ensure that the UI matches the figma mockup and that confirming the change triggers a UI alert

Appellant and POA/Representative Timezone/Email

1. Shadow user BVASYELLOW
2. Navigate to the hearing schedule and choose a 'Central' hearing
3. Click the 'Edit Hearing Details' link and change to a 'Virtual' hearing
4. Change either the timezone or the email for both the appellant and the POA/Representative
5. Ensure that the UI matches the figma mockup and that confirming the change triggers a UI alert

User Facing Changes

• Screenshots of UI changes added to PR & Original Issue

Hearing Time

Change Email or Timezone Appellant or Poa/Representative

Change Email or Timezone Appellant and Poa/Representative

Storybook Story

For Frontend (Presentationa) Components

• Add a Storybook file alongside the component file (e.g. create MyComponent.stories.js alongside MyComponent.jsx)
• Give it a title that reflects the component's location within the overall Caseflow hierarchy
• Write a separate story (within the same file) for each discrete variation of the component

[va-bot]

	2 Warnings
⚠️	This is a Big PR. Try to break this down if possible. Stacked pull requests encourage more detailed and thorough code reviews
⚠️	This PR modifies React components — consider adding/updating corresponding Storybook file

Generated by 🚫 Danger

[codeclimate]

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[ferristseng]

Looks great! The tests look really good too! I found one small thing I think where changing the representative email, and the appellant time leads to a modal that doesn't have a separator: