Automatic merge from submit-queue
Shorten issue template.
**What this PR does / why we need it**:
As discussed on contrib-ex, this shortens the github issue template.
- Be more explicit about sending people to stackoverflow for support
- Add boilerplate for setting an issue as a bug or feature
- Add boilerplate for setting a SIG
- Cut out the rest for brevity.
Automatic merge from submit-queue
Update troubleshooting link in ISSUE_TEMPLATE.md
**What this PR does / why we need it**:
Since our troubleshooting page has been moved, we should update the issue template.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
ref: #44434
**Release note**:
```release-note
NONE
```
- updated the headline
- updated the checklist numbers (was all "1.")
- converted the instructions into a markdown comment to make it
clearer what is an instruction.
