Describe the bug

When no placeholder is set, for example when using floatlabel, the dropdown is dirty immediately upon loading.

Pull Request Link

No response

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

No response

Reproducer

See stackblity of select with float label in official documentation

Environment

Check official documentation select with floatlabel

Angular version

latest

PrimeNG version

v19

Node version

No response

Browser(s)

No response

Steps to reproduce the behavior

• Open the stackblitz of select+float label
• Remove the placeholder
• Add any validator like required
• reload the page
• immedately the dropdown will be "red" as it is invalid and dirty

Expected behavior

Should not be dirty before being edited.