Revert certmanager-issuer time zone change
What does this MR do?
This backports !4043 (merged) to 8-7-stable.
!3649 (merged)
add a timezone env change for all pods, but this breaks existing
deployments of certmanager-issuer since the spec is immutable.
The only workarounds are:
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Manually remove the certmanager-issuerjob
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Use helm upgrade --force(https://github.com/cert-manager/cert-manager/issues/1927)
Let's revert this change to minimize the impact on existing installations. New installations may run into the same issue, however.
Relates to gitlab-com/gl-infra/delivery#20801 (closed)
Changelog: fixed
Related issues
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Merge Request Title and Description are up to date, accurate, and descriptive. 
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MR targeting the appropriate branch. 
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MR has a green pipeline. 
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Documentation created/updated. 
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Tests added/updated, and test plan for scenarios not covered by automated tests. 
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Equivalent MR/issue for omnibus-gitlab opened. 
Reviewers checklist
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MR has a green pipeline on https://gitlab.com/gitlab-org/charts/gitlab. 
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Consider downstream impact to the Operator, as per evaluating impact from changes to GitLab Chart. 
Edited  by Stan Hu