Changes

refactor(tidb/release-8.5): Increase the timeout duration for tidb unit-test and integration-br-test (#3984)

increase timeout duration for tidb test:
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https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Frelease-8.5%2Fpull_br_integration_test/detail/pull_br_integration_test/1159/pipeline
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https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Frelease-8.5%2Fpull_unit_test/detail/pull_unit_test/3958/pipeline
 (commit: ca9c3ec)