fix(grid): ensure resize observer is only created if available in ssr - 21.2.x

[mddragnev]

Closes #17497

Description

Motivation / Context

Type of Change (check all that apply):

• Bug fix
• New functionality
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (no functional changes)
• Documentation
• Demos
• CI/CD
• Tests
• Changelog
• Skills/Agents

Component(s) / Area(s) Affected:

How Has This Been Tested?

• Unit tests
• Manual testing
• Automated e2e tests

Test Configuration:

• Angular version:
• Browser(s):
• OS:

Screenshots / Recordings

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code (test guidelines)
• This PR includes API docs for newly added methods/properties (api docs guidelines)
• This PR includes feature/README.MD updates for the feature docs
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes ng update migrations for the breaking changes (migrations guidelines)
• This PR includes behavioral changes and the feature specification has been updated with them
• Accessibility (ARIA, keyboard navigation, focus management) has been verified

[Copilot]

Pull request overview

Fixes an SSR build-time crash triggered by the grid’s virtualization directive attempting to instantiate ResizeObserver when it isn’t available (e.g., during server-side rendering), aligning behavior with issue #17497.

Changes:

• Guarded ResizeObserver instantiation in IgxGridForOfDirective.ngOnInit() by checking getResizeObserver() for availability first.
• Prevented server/runtime errors in environments where window.ResizeObserver is undefined.

---

💡 Add a code-review agent skill for context-aware, tailored reviews. Learn more in the docs.