fix: fix a race condition in the tracker #19513
                
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What this PR does / why we need it:
This commit fixes a race condition in the push tracker where both the p.done and p.err channels could have a value at the same time. This could cause the distributor to return success when it should instead have returned an error.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Checklist
CONTRIBUTING.mdguide (required)featPRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.docs/sources/setup/upgrade/_index.mddeprecated-config.yamlanddeleted-config.yamlfiles respectively in thetools/deprecated-config-checkerdirectory. Example PR