[release/3][BACKPORT] [prometheus] Bump to 12.11.10

[d2iq-mergebot]

This is a backport of the following PR:

#1015

What type of PR is this?

bug

What this PR does/ why we need it:

mesosphere/charts#1038
Use existing storage spec from previous installation if upgrading to avoid creating new pvc due to bug in previous 9.3.x charts

Which issue(s) this PR fixes:

https://jira.d2iq.com/browse/COPS-6870

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

fix(prometheus): In upgrades, use existing PVC from previous installation.

Checklist

• The commit message explains the changes and why are needed.
• The code builds and passes lint/style checks locally.
• The relevant subset of integration tests pass locally.
• The core changes are covered by tests.
• The documentation is updated where needed.

[d2iq-mergebot]

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