fix(table): prevent duplicate lazy load emission when filter on input

[faried-elrewany]

Description

When <p-columnFilter> is configured with [filterOn]="'input'", typing triggers onModelChange(), which immediately calls dataTable._filter(). Pressing Enter subsequently fired onTextInputEnterKeyDown or onNumericInputKeyDown, which unconditionally invoked dataTable._filter() a second time, resulting in duplicate onLazyLoad event emissions.

Changes:

• Guarded onTextInputEnterKeyDown and onNumericInputKeyDown in ColumnFilterFormElement to bypass _filter() when filterOn === 'input'.
• Preserved standard Enter key filtering behavior when filterOn === 'enter'.
• Added unit test coverage verifying a single onLazyLoad emission across text and numeric filters.

Related issues

Fixes #884

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that changes the public API)
• Documentation only
• Refactor, test, or chore (no user-facing change)

Breaking changes

None

Test plan

• npm test (ran pnpm --filter @openng/optimus-ui test:unit - 3 new tests passed)
• npm run lint (npx eslint passed with 0 errors)
• Verified unit tests covering both text and numeric lazy filter double-emission scenarios.

Checklist

• Issue discussed or bug clearly described (link issue when applicable)
• Tests added or updated for behavioral changes
• Documentation updated (README, JSDoc, migration notes as needed)
• Public API changes documented; breaking changes called out
• CHANGELOG updated (if the repository maintains one and the change is user-facing)
• Commit messages follow Conventional Commits
• I agree to follow the OpenNG Foundation Code of Conduct

Additional context

Prevents unnecessary backend network roundtrips triggered by duplicate onLazyLoad emissions on server-side paginated/filtered tables.