[improve][CI] Remove "Cancel duplicate workflows" workflow #17490
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Motivation
there's no need for "CI - Cancel duplicate workflows" workflow anymore since GitHub Actions has built-in support
for cancelling duplicate workflows and this is used in Pulsar CI workflows.
GitHub Actions announced support in 4/2021
Pulsar workflows contain
It has also been added to all
apache/pulsar
maintenance branches to prevent issues where cherry-picking many commits causes the build queue to fill up:https://lists.apache.org/thread/29qox3y9z38z2t4441jhlnv6x71kfhdn
Modifications
remove
.github/workflows/ci-cancel-duplicate-workflows.yaml
doc-not-needed