[FIX] Updated regex for the application name to not accept "."

[harshlakhara]

fix(@angular-cli): Updated the regex to invalidate the application name with "." in it. As the validation for project name doesn't accept "." in the name and thorows the error: "Data path "/projects" must NOT have additional properties(xyx.com)"

PR Checklist

Please check to confirm your PR fulfills the following requirements:

• [x] 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?

• [x] 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?

Issue Number: #25704

What is the new behavior?

After the fix user creating new project will not be allowed to enter "." in the name of the application. i.e. xyz.com will get invalidated.

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

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[alan-agius4]

Let go with https://github.com/angular/angular-cli/pull/26909 as dots are fine.

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