chore: use different cypress-split seed per PR

This allows:
1. detect tests that depend on each other
2. reduces places where test fail because only the expensive tests are
   queued next to each other.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

.github/workflows/cypress.yml

@@ -194,6 +194,7 @@ jobs:
           CYPRESS_RECORD_KEY: ${{ secrets.CYPRESS_RECORD_KEY }}
           SPLIT: ${{ matrix.total-containers }}
           SPLIT_INDEX: ${{ matrix.containers == 'component' && 0 || matrix.containers }}
+          SPLIT_RANDOM_SEED: ${{ github.run_id }}
           SETUP_TESTING: ${{ matrix.containers == 'setup' && 'true' || '' }}
 
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