fix(input): remove placeholder from button accessibility tree

[Splaktar]

PR Checklist

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• The commit message follows our guidelines
• Tests for the changes have been added or this is not a bug fix / enhancement
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PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Enhancement
[ ] Documentation content changes
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Input placeholders appeared in screen reader button accessibility trees as interactive elements due to ng-aria.

Issue Number:
Fixes #11293

What is the new behavior?

Input placeholders no longer appear in screen reader button accessibility trees as interactive elements.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Verified fix in this CodePen