Send start and completion time to external logs proxy

[AverageMarcus]

Changes

Fixes #2908

Include the startTime and completionTime of the TaskRun when calling out to the external logs proxy so that queries against the long-term log storage can be optimised to search a targeted timeframe if possible.

These are included as query parameters to allow for backwards-compatibility with existing route handling logic that might be being used.

/kind feature

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs included if any changes are user facing
  • No existing docs for external-logs aside from the walkthrough. This change doesn't cause a change to those docs.
• Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including
  functionality, content, code)
• Has a kind label. You can add one by adding 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 (new features, significant UI changes, API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

Include the TaskRun's `startTime` and `completionTime` as query parameters when making requests to the external-logs proxy.

[tekton-robot]

Hi @AverageMarcus. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[AlanGreene]

/ok-to-test

[AlanGreene]

Hi @AverageMarcus, thanks for the contribution (including tests!). Overall this approach looks good, should be backwards compatible, and could be useful to other users, so it makes sense to include it 👍

I've made a few small suggestions below, let me know if you have any questions.

[AlanGreene]

Thanks Marcus
/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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