fix: query-related fields now have a "hidden" CSS class

[esm7]

Description

Fixes the bug linked below, caused by the code that treats query fields (in contrast to task fields) not using the same flow.

Motivation and Context

Fixes #1866

How has this been tested?

1. Checked using the Obsidian Developer Console.
2. Added the relevant classes to the smoke tests in the test vault.

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 for users)
• Sample vault (prefix: vault - improvements to the Tasks-Demo sample vault)
• Contributing Guidelines (prefix: contrib - any improvements to documentation content for contributors - see Contributing to Tasks)

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

[esm7]

Please note that with the default settings, this PR adds a tasks-layout-hide-urgency class to the query results HTML item that was not there before. This is because by default urgency is hidden, and I did not think that this fact justifies to make this setting inconsistent and work differently (e.g. have a tasks-layout-show-urgency class instead).

[claremacrae]

Trivia, for reference in future PRs...

@esm7 FYI I have edited the description so that it says:

Fixes https://github.com/obsidian-tasks-group/obsidian-tasks/issues/1866

This would also work and is displayed the same:

Fixes #1866

This way, GitHub detects the link between the PR and the issue, and will close the issue with appropriate link when the PR is merged..