fix(gatsby): Fix errorHandler signature to match bundler-plugin-core API #45185

Job	Run time
job_get_metadata / Get Metadata	7s
Check file formatting	50s
Check lockfile	3m 8s
Build	7m 6s
Check PR branches	5s
Browser Unit Tests	1m 27s
Lint	1m 6s
Circular Dependency Check	1m 45s
Size Check	2m 10s
Check for faulty .d.ts files	46s
Prepare E2E tests	3m 3s
Node (24) Unit Tests	1m 49s
Cloudflare Integration Tests	56s
Node (18) Unit Tests	1m 32s
Node (20) Unit Tests	1m 33s
Node (22) Unit Tests	1m 37s
Node (${{ matrix.node }})${{ (((matrix.typescript && format(' (TS {0})', matrix.typescript))) \|\| '') }} Integration Tests	0s
Bun Unit Tests	0s
Node (${{ matrix.node }})${{ (((matrix.typescript && format(' (TS {0})', matrix.typescript))) \|\| '') }} Node-Core Integration Tests	0s
Upload Artifacts	0s
Node Overhead Check	0s
Remix (Node ${{ matrix.node }}) Tests	0s
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
All required jobs passed or were skipped	3s
E2E ${{ (matrix.label \|\| matrix.test-application) }} Test	0s
E2E ${{ (matrix.label \|\| matrix.test-application) }} Test (optional)	0s
	29m 3s

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