fix: [cherrypick][V12.3.0] Redesign Signature Message date values

[digiwand]

Description

Cherry-pick #27249 for v12.3.0

Fix date values:

• Formerly, conversations were converting values as if they were milliseconds. However, these values come from Solidity where these timestamps are unix timestamps in seconds.
• Support -1 (no expiration) value
• Display "expiry" as a date instead of a unix timestamp

This PR fixes the conversion.

Fixes: #27137

1. Go to test-dapp
2. Request Permit or another TypedSign request
3. Observe deadlines and dates

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding
  Standards.

• I've completed the PR template to the best of my ability

• I’ve included tests if applicable

• I’ve documented my code using JSDoc format if applicable

• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).

• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

Builds ready [06e2114]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • common: 0, 1, 10, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1788 ± 89 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	290	2263	1710	373	179
		domContentLoaded	1557	2162	1751	171	82
		load	1595	2289	1788	185	89
		domInteractive	15	65	36	13	6

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.14%. Comparing base (439f7d6) to head (74c7dc0).
Report is 17 commits behind head on Version-v12.3.0.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           Version-v12.3.0   #27305      +/-   ##
===================================================
- Coverage            70.24%   70.14%   -0.11%     
===================================================
  Files                 1426     1432       +6     
  Lines                50239    50430     +191     
  Branches             13954    13992      +38     
===================================================
+ Hits                 35289    35370      +81     
- Misses               14950    15060     +110     

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