fix(sveltekit): Guard `process` check when flushing events #33283

Job	Run time
Get Metadata	4s
Build	47s
Check PR branches	2s
Check file formatting	47s
Size Check	1m 22s
Lint	4m 51s
Upload Artifacts	0s
Browser Unit Tests	44s
Bun Unit Tests	0s
Circular Dependency Check	1m 15s
Node (18) Unit Tests	1m 2s
Node (20) Unit Tests	51s
Check for faulty .d.ts files	34s
Node (22) Unit Tests	1m 1s
Deno Unit Tests	0s
PW ${{ matrix.bundle }} Tests	0s
Playwright ${{ matrix.bundle }}${{ ((matrix.project && (matrix.project != 'chromium') && format(' {0}', matrix.project)) \|\| '') }}${{ ((matrix.shard && format(' ({0}/{1})', matrix.shard, matrix.shards)) \|\| '') }} Tests	0s
Prepare E2E tests	1m 44s
Node (${{ matrix.node }})${{ ((matrix.typescript && format(' (TS {0})', matrix.typescript)) \|\| '') }} Integration Tests	0s
Remix (Node ${{ matrix.node }}) Tests	0s
E2E node-exports-test-app Test	1m 56s
E2E sveltekit-2-svelte-5 Test	2m 27s
E2E sveltekit-2.5.0-twp Test	1m 49s
E2E sveltekit-2 Test	2m 9s
E2E ${{ matrix.label \|\| matrix.test-application }} Test (optional)	0s
E2E sveltekit-cloudflare-pages Test	2m 2s
All required jobs passed or were skipped	1s
	25m 28s

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