WIP: address logs memory leak, but avoid canceled context on UpdateLog call

[gabemontero]

Changes

multi-threaded alternative to https://github.com/tektoncd/results/pull/712

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Release Notes

[tekton-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/watcher/reconciler/dynamic/dynamic.go	69.3%	63.4%	-5.9

[gabemontero]

between our stress tests finding some issues with this form of the mem leak fix, and both our stress test and individual testing looking better with our preferred, reduce thread solution in #712 I'm closing this PR.