[BEAM-6669] Set Dataflow KMS key name (Python)

[udim]

Use the official Environment.service_kms_key_name proto field to pass
--dataflow_kms_key to the runner.

---

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Post-Commit Tests Status (on master branch)

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

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.

[udim]

run python postcommit

[udim]

R: @lukecwik

[udim]

retrying postcommits - ran out of quota:

Workflow failed. Causes: Project apache-beam-testing has insufficient quota(s) to execute this workflow with 1 instances in region us-central1. Quota summary (required/available): 1/7235 instances, 1/0 CPUs, 250/115509 disk GB, 0/4046 SSD disk GB, 1/246 instance groups, 1/247 managed instance groups, 1/189 instance templates, 1/490 in-use IP addresses.

[udim]

run python postcommit

[lukecwik]

run python postcommit

[lukecwik]

I fixed the "multimap" serialization issue that was impacting Python ITs

[lukecwik]

LGTM assuming tests are green

[udim]

I'm Investigating Python precommit failures. https://issues.apache.org/jira/browse/BEAM-7111

[udim]

Correction: postcommits

[udim]

run python postcommit

[udim]

run python postcommit

[aaltay]

Can we merge this?

[lukecwik]

Yes, I was waiting for the tests to be green which was the primary reason for the delay.