chore(ci): mark web-sveltekit:e2e_test as flaky (#63351)

Marks the `web-sveltekit:e2e_test` as flaky (tries them up to three
times). It just failed main on this build
http://github.com/sourcegraph/sourcegraph/commit/db7a268c34e7908e03477fedb166bcd0ed39b179

## Test plan

ci

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Author: jhchabran

client/web-sveltekit/BUILD.bazel

@@ -212,6 +212,7 @@ playwright_test_bin.playwright_test(
         "BAZEL_SKIP_TESTS": "clone in progress;commit not found;not cloned;error loading commit information",
         "ASSETS_DIR": "./client/web-sveltekit/test_app_assets/test_build/_sk/",
     },
+    flaky = True,
 )
 
 TESTS = glob([