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

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• I’ve included tests if applicable

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[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