by default, don't give montior any cross-namespace access #907
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What problem does this PR solve?
Fixes #862. #854 enabled cross-namespace access in the tidb-cluster deployment.
What is changed and how does it work?
By default use the previous code. Add an option to use new code.
This maintains backwards compatibility with the previous chart.
Check List
Tests
I deployed both versions to a local kind cluster
Code changes
Related changes
Does this PR introduce a user-facing change?:
This maintains backwards compatibility. Most users won't need to change this setting.