github: add spoiler tags to bug report issue template

[agilgur5]

Description

What this PR does / why we need it:

• long logs of output or long configs are hard on the eyes and make it difficult to read through issues as they take up a lot of space
  • so it would be better, in my opinion, to hide them by default with spoiler tags, which can be opened up when further investigation is warranted
• I used this in an issue I've reported here and have also done this and implemented this in other repos

Tags

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
N/A

Can see examples of spoiler tag usage in my own #541

Can see examples of very long output logs and/or configs in #417, #424, etc

A similar example is in ezolenko/rollup-plugin-typescript2#244 as well.

Review Notes

Feel free to reject this if you don't think it'll be that useful in this context, thought I'd suggest it at least.

See Rendered Version
The spoiler tags aren't properly indented unfortunately. While you can indent them under the bullets, the logs themselves then need to be indented as well, which I think is too difficult for users and so will be ignored. If the logs aren't indented, then they don't make it into the spoiler tag anyway 😕 . So I think having them unindented and allowing for straight copy+paste is better, but does look a bit funky. Suggestions welcome.

[k8s-ci-robot]

Hi @agilgur5. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[serathius]

This is really great idea!! thanks
/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: agilgur5, serathius

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