fix(vite-plugin-angular): remove numbers from beginning of file name selector

[joshuamorony]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/analogjs/analog/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:

Which package are you modifying?

• vite-plugin-angular
• vite-plugin-nitro
• astro-angular
• create-analog
• router
• platform
• content
• nx-plugin
• trpc

What is the current behavior?

Similar to #919

When attempting to create a component using a .agx file:

  import(
    `../../../content/modules/lessons/angular-getting-started/01-generating-angular-app.agx`
  ).then((m) => {
    divPost().createComponent(m.default);
    cdr.detectChanges();
  });

It will fail if the file name begins with numbers, as this is used to generate a selector for the component of 01-generating-angular-app and then createComponent will try to use that as the tag name but it is invalid.

What is the new behavior?

This change strips any leading numbers/hyphen from the selector generated from the file name, so 01-generating-angular-app.agx would result in a selector of generating-angular-app

This change applies to all file name based selectors not just .agx files

Does this PR introduce a breaking change?

• Yes
• No

Other information

[optional] What gif best describes this PR or how it makes you feel?

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