feat: Add created date to EditTask modal

[vanadium23]

Description

Add read only span of created date to EditTask modal.

Motivation and Context

Closes #1742.

How has this been tested?

Only via manual testing, with switch on/off settings.

Screenshots (if appropriate)

Types of changes

Changes visible to users:

• Bug fix (prefix: fix - non-breaking change which fixes an issue)
• New feature (prefix: feat - non-breaking change which adds functionality)
• Breaking change (prefix: feat!! or fix!! - fix or feature that would cause existing functionality to not work as expected)
• Documentation (prefix: docs - improvements to any documentation content)
• Sample vault (prefix: vault - improvements to the Tasks-Demo sample vault)

Internal changes:

• Refactor (prefix: refactor - non-breaking change which only improves the design or structure of existing code, and making no changes to its external behaviour)
• Tests (prefix: test - additions and improvements to unit tests and the smoke tests)
• Infrastructure (prefix: chore - examples include GitHub Actions, issue templates)

Checklist

• My code follows the code style of this project and passes yarn run lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• My change has adequate Unit Test coverage.

Terms

• My contribution follow this project's contributing guide
• I agree to follow this project's Code of Conduct

[claremacrae]

I tested this and it worked fine, and adjusted the layout correctly if I made the window really narrow.