FilterBuilder: fix invalid date formatting (T1319193)

[anna-shakhova]

No description provided.

[Copilot]

Pull request overview

Fixes FilterBuilder’s handling of invalid date values by preventing attempts to format invalid Date instances and expanding/relocating related test coverage.

Changes:

• Treat invalid Date objects as invalid input in formatHelper.format() (returning value.toString() instead of passing them to date localization formatting).
• Adjust FilterBuilder value formatting to avoid coercing non-string/non-numeric values into Date objects.
• Update/add tests: expand formatHelper.format() coverage and move FilterBuilder formatting tests from QUnit to Jest (plus add a regression case).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/devextreme/testing/tests/DevExpress.utils/utils.formatHelper.tests.js	Switches to ESM import and adds QUnit coverage for formatHelper.format() edge cases (including invalid dates).
packages/devextreme/testing/tests/DevExpress.ui.widgets/filterBuilderParts/utilsTests.js	Removes the old QUnit “Formatting” module tests (migrated to Jest).
packages/devextreme/js/format_helper.js	Prevents formatting invalid Date values by validating getTime() before delegating to date localization.
packages/devextreme/js/__internal/filter_builder/m_utils.ts	Updates FilterBuilder value-to-text formatting (incl. typed refactor) to avoid unintended Date coercions.
packages/devextreme/js/__internal/filter_builder/tests/utils.test.ts	Adds Jest coverage for FilterBuilder value formatting, including an invalid date string regression.