set default spark timezone conf to UTC

[sxztthxq]

[zhangyuan]

在Linux中，一般用 TZ 环境变量设置时区。可以读取这个变量，不存在时再设置默认值？

比如

TZ=UTC0 date

不过 Spark SQL在某些情况下，也会读取TZ? https://spark.apache.org/docs/3.1.1/sql-ref-syntax-aux-conf-mgmt-set-timezone.html

[mergify[bot]]

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[mergify[bot]]

This pull request's title is not fulfill the requirements. @sxztthxq please update it 🙏.

Valid format:

fix(query): fix group by string bug
  ^         ^---------------------^
  |         |
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  +-------> Type: feat, fix, refactor, ci, build, docs, website, chore

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[mergify[bot]]

This pull request's title is not fulfill the requirements. @sxztthxq please update it 🙏.

Valid format:

fix(query): fix group by string bug
  ^         ^---------------------^
  |         |
  |         +-> Summary in present tense.
  |
  +-------> Type: feat, fix, refactor, ci, build, docs, website, chore

Valid types:

• feat: this PR introduces a new feature to the codebase
• fix: this PR patches a bug in codebase
• refactor: this PR changes the code base without new features or bugfix
• ci|build: this PR changes build/testing/ci steps
• docs|website: this PR changes the documents or websites
• chore: this PR only has small changes that no need to record
• type(scope)!: this type of PR introduces breaking changes to the codebase