Remove duplicate env var TZ from monitor spec

[ari-e]

What problem does this PR solve?

Monitor can be created with duplicate environment variable TZ. This is both theoretically a bad thing to do but also practically can trigger some bugs in k8s when it comes to pod GC.

What is changed and how does it work?

Don't add TZ twice in monitor util

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[sre-bot]

All committers have signed the CLA.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csuzhangxc

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• OWNERS [csuzhangxc]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-27 10:11:27.915940764 +0000 UTC m=+865083.050390882: ☑️ agreed by csuzhangxc.

[csuzhangxc]

/cherry-pick release-1.6

[csuzhangxc]

/cherry-pick release-1.5

[ti-chi-bot]

@csuzhangxc: new pull request created to branch release-1.6: #5722.

In response to this:

/cherry-pick release-1.6

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

@csuzhangxc: new pull request created to branch release-1.5: #5723.

In response to this:

/cherry-pick release-1.5

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.