[WIP] Logs API apporach to fix race condition due to pruning in results watcher

[ramessesii2]

Changes

Fixes #514
/kind bug

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you review them:

• Has Docs included if any changes are user facing
• Has Tests included if any functionality added or changed
• Tested your changes locally (if this is a code change)
• Follows the commit message standard
• Meets the Tekton contributor standards (including functionality, content, code)
• Has a kind label. You can add a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• Release notes block below has been updated with any user-facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contain the string "action required" if the change requires additional action from users switching to the new release

Release Notes

Free up resources (PipelineRun/TaskRun) potentially without any race conditions in pruning w.r.t to streaming logs even with no Grace Period. 

[tekton-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To complete the pull request process, please assign dibyom after the PR has been reviewed.
You can assign the PR to them by writing /assign @dibyom in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[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%	66.0%	-3.3
pkg/watcher/results/logs.go	50.0%	40.9%	-9.1

[ramessesii2]

/hold
For #704

[tekton-robot]

@ramessesii2: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-tekton-results-build-tests	5294227	link	true	/test pull-tekton-results-build-tests

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[tekton-robot]

@ramessesii2: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.