chore: add external/ directory to gitignore #631

Job	Run time
Run CI Pipeline / 🧹 Lint Check / Run Lint Check	34s
Run CI Pipeline / 🔍 Type Check / Run Type Check	26s
Run CI Pipeline / 🧪 Test Matrix / Test Node 24.10.0 on macos-latest	2m 14s
Run CI Pipeline / 🧪 Test Matrix / Test Node 24.10.0 on ubuntu-latest	1m 13s
Run CI Pipeline / 🧪 Test Matrix / Test Node 24.10.0 on windows-latest	2m 2s
E2E Tests (24.10.0, ubuntu-latest)	1m 16s
Unit Tests (Shard 2/3)	2m 39s
Unit Tests (Shard 3/3)	2m 10s
Unit Tests (Shard 1/3)	3m 51s
Unit Tests (Shard 3/3)	3m 24s
Unit Tests (Shard 1/3)	3m 5s
Unit Tests (Shard 2/3)	3m 38s
Unit Tests (Shard 3/3)	3m 21s
Unit Tests (Shard 2/3)	4m 3s
Unit Tests (Shard 1/3)	2m 51s
	36m 47s

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