Backport: Fix Sidekiq workers delete each other's metrics

What does this MR do?

This backports !66432 (merged) for the 14-0-stable-ee-patch-8 patch release.

See !66432 (comment 657805016)

Per https://gitlab.com/gitlab-org/release/docs/blob/master/general/patch/process.md#process-for-developers:

• Create a new MR against the corresponding stable branches, e.g. for a 12.10 backport you'd use 12-10-stable-ee as the target branch, and the %12.10 milestone.
• Go through the usual code review process, and after the maintainer review assign the MR to release managers.

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

• I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)
• I have tested this MR in all supported browsers, or it's not needed.
• I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.