docs: Updates issue and PR templates.

.github/pull_request_template.md

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+Checklist:
+
+* [ ] Either (a) I've created an [enhancement proposal](https://github.com/argoproj/argo/issues/new/choose) and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
+* [ ] The title of the PR is (a) [conventional](https://www.conventionalcommits.org/en/v1.0.0/), (b) states what changed, and (c) suffixes the related issues number. E.g. `"fix(controller): Updates such and such. Fixes #1234"`. Why? for the release notes. 
+* [ ] Optional. I've added My organization is added to the README.
+* [ ] I've signed the CLA and required builds are green. 

ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+assignees: ''
+---
+Checklist:
+
+ * [ ] I've included the version.
+ * [ ] I've included reproduction steps.
+ * [ ] I've included the workflow YAML.
+ * [ ] I've included the logs.
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- Argo version:
+```
+$ argo version
+```
+- Kubernetes version :
+```
+$ kubectl version -o yaml
+```
+
+**Other debugging information (if applicable)**:
+- workflow result:
+```
+argo get <workflowname>
+```
+- executor logs:
+```
+kubectl logs <failedpodname> -c init
+kubectl logs <failedpodname> -c wait
+```
+- workflow-controller logs:
+```
+kubectl logs -n argo $(kubectl get pods -l app=workflow-controller -n argo -o name)
+```
+
+**Logs**
+
+```
+argo get <workflowname>
+kubectl logs <failedpodname> -c init
+kubectl logs <failedpodname> -c wait
+kubectl logs -n argo $(kubectl get pods -l app=workflow-controller -n argo -o name)
+```

ISSUE_TEMPLATE/enhancement_proposal.md

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+---
+name: Enhancement proposal
+about: Propose an enhancement for this project
+title: ''
+labels: 'enhancement'
+assignees: ''
+---
+# Summary
+
+What change you think needs making.
+
+# Motivation
+
+Please give examples of your use case, e.g. when would you use this.
+
+# Proposal
+
+How do you think this should be implemented?