MHV-57660 reworked reply draft page to follow new design

[KolbyVA]

Summary

Reworks the draft reply page in accordance with new "multiple draft" solution designs. Also has minor tweaks for thread list page.

Related issue(s)

https://jira.devops.va.gov/browse/MHV-57660

Modify "Reply" button for multiple draft scenario (See details below)

User Story: As a Secure Messaging User, I want to be able to have multiple drafts in a message thread.

Testing done

Manual testing tbd in Review Instance.

Screenshots

Desktop:

Mobile:

What areas of the site does it impact?

Secure-messaging

Acceptance criteria

Quality Assurance & Testing

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Linting warnings have been addressed
• Documentation has been updated (link to documentation *if necessary)
• Screenshot of the developed feature is added
• Accessibility testing has been performed

Error Handling

• Browser console contains no warnings or errors.
• Events are being sent to the appropriate logging solution
• Feature/bug has a monitor built into Datadog or Grafana (if applicable)

Authentication

• Did you login to a local build and verify all authenticated routes work as expected with a test user

⚠️ Team Sites (only applies to modifications made to the VA.gov header) ⚠️

• The vets-website header does not contain any web-components
• I used the proxy-rewrite steps to test the injected header scenario
• I reached out in the #sitewide-public-websites Slack channel for questions

Requested Feedback

(OPTIONAL) What should the reviewers know in addition to the above. Is there anything specific you wish the reviewer to assist with. Do you have any concerns with this PR, why?

[oleksii-morgun]

Great work. Good unit test coverage. I highlighted few things to look at

[oleksii-morgun]

This may have brought up already, but I am noticing that upon clicking Edit draft replies, Draft accordions are expanded but the accordion set still has Expand all+ buttons instead of Collapse all-