fix: use Reflect API (2016) instead of Object.hasOwn (2021)

[Mrazator]

Use a more stable Reflect API (since 2016 in major browsers) for handling observedAppState, instead of Object.hasOwn (since 2021 in major browsers).

The next step is possibly polyfilling the APIs (such as Reflect) through @vitejs/plugin-legacy and it's specifiers https://www.npmjs.com/package/@vitejs/plugin-legacy#polyfill-specifiers.

Can I use Reflect? https://caniuse.com/mdn-javascript_builtins_reflect

Fixes #7957

[vercel]

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Name	Status	Preview	Updated (UTC)
excalidraw	✅ Ready (Inspect)	Visit Preview	Apr 25, 2024 0:43am
excalidraw-package-example	✅ Ready (Inspect)	Visit Preview	Apr 25, 2024 0:43am
excalidraw-package-example-with-nextjs	✅ Ready (Inspect)	Visit Preview	Apr 25, 2024 0:43am

1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
docs	⬜️ Ignored (Inspect)		Apr 25, 2024 0:43am

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔴	Lines	65.42% (🎯 70%)	50879 / 77766
🔴	Statements	65.42% (🎯 70%)	50879 / 77766
🔴	Functions	66.55% (🎯 68%)	1558 / 2341
🟢	Branches	80.97% (🎯 70%)	6247 / 7715

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
packages/excalidraw/store.ts	96.87%	96.2%	95.83%	96.87%	228-234, 262-263, 304-305, 332-333

Generated in workflow #2355