fix: Allow multiple spaces after onCompletion emoji

[claremacrae]

Types of changes

Changes visible to users:

• Bug fix (prefix: fix - non-breaking change which fixes an issue)

Internal changes:

• Tests (prefix: test - additions and improvements to unit tests and the smoke tests)

Description

Multiple spaces are now allowed between 🏁 and its value.

I found this whilst doing preparatory refactoring to fix #3179.

Also, adjust test to confirm that parsing of on completion field is case-insensitive.

Motivation and Context

Fix unreported bug that the Tasks Emoji format did not allow more than one space between the emoji and value.

• 🏁 delete worked
• 🏁 delete was not parsed, and was considered part of the task description

How has this been tested?

• Added failing test to show the problem
• Did exploratory testing to confirm it's fixed

Checklist

• My code follows the code style of this project and passes yarn run lint.
• My change has adequate Unit Test coverage.

Terms

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

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud