[BEAM-9288] Not bundle conscrypt in gRPC vendor in META-INF

[amaliujia]

R: @lukecwik @sunjincheng121

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Post-Commit Tests Status (on master branch)

Lang	SDK	Apex	Dataflow	Flink	Gearpump	Samza	Spark
Go		---	---		---	---
Java
Python		---			---	---
XLang	---	---	---		---	---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

See .test-infra/jenkins/README for trigger phrase, status and link of all Jenkins jobs.

[amaliujia]

Tested by running

jar tvf vendor/grpc-1_26_0/build/libs/beam-vendor-grpc-1_26_0-0.3.jar | grep conscrypt

[amaliujia]

This PR further excludes conscrypt from vendored grpc jar, which is a subsequent work of #10940

[amaliujia]

Run CommunityMetrics PreCommit

[amaliujia]

Run Python PreCommit

[amaliujia]

@lukecwik all green. Please feel free to merge this PR and start vendored gRPC release.