Run e2e with 2 threads to reduce runtime

[cydrain]

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[cydrain]

/hold

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[cydrain]

https://jenkins.milvus.io:18080/blue/organizations/jenkins/knowhere%2Fkn2/detail/PR-1091/2/pipeline

It seems that running pytest in parallel causes the system to crash consistently.

[cydrain]

/close

[sre-ci-robot]

@cydrain: Closed this PR.

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/close

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