refactor(@schematics/angular): remove empty constructor from directive template

[cexbrayat]

PR Checklist

Please check to confirm your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular-cli/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

The directive template generates an empty constructor, which not really useful in modern Angular where inject is preferred.

What is the new behavior?

Align directive template with the component template cleanup done in 301b566.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[gemini-code-assist]

Code Review

This pull request removes an empty constructor from the Angular directive template to streamline the generated code. As there are no review comments provided, I have no further feedback to offer.

[dgp1130]

This PR was merged into the repository. The changes were merged into the following branches:

• main: 06dc095