Add PR template, and HCP doc specific template (#1030)

Add PR template selector (default PR template) and HCP doc template.

Example of main template allowing someone to tack on their desired
template

<img width="1358" height="782" alt="image"
src="https://github.com/user-attachments/assets/01e3780a-ce03-4e7f-906e-aa9314ce0bcb"
/>

Author: jonathanfrappier

.github/PULL_REQUEST_TEMPLATE/hcp_pull_request_template.md

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+## Description
+
+<!-- ID for Jira ticket e.g [SPE-1234] -->
+
+:ticket: [Jira ticket]
+
+<!-- Add a brief description of changes here. Include any other necessary relevant links -->
+
+<!-- Help your reviewer understand the type of review you need by selecting the scope and urgency. -->
+
+### Requested review scope:
+
+- [ ] Content touched by the PR _only_ (typos, clarifications, tips)
+- [ ] Code test (command and code block changes)
+- [ ] Flow and language near changes (new/rearranged steps)
+- [ ] Review everything (rewrites, major changes)
+
+### Review urgency:
+
+- [ ] ASAP (bug fixes, broken content, imminent releases)
+- [ ] 3 days (small changes, easy reviews)
+- [ ] 1 week (default)
+- [ ] Best effort (very non-urgent)
+
+<!-- Fill out only the appropriate checklist for your type of feature (or both if necessary) and delete the other one! -->
+
+## All updates:
+
+<!-- This section is mandatory for all PRs: -->
+
+I have:
+
+- [ ] Verified that all status checks have passed
+- [ ] Verified that preview environment has successfully deployed
+- [ ] Verified appropriate `label` applied (`hcp` + `product name`)
+- [ ] Added all required reviewers (code owners and external)
+
+## Content checklist (optional)
+
+Please do these things before requesting a review. I have:
+
+- [ ] Made any associated code repositories public
+- [ ] Added the `hashicorp-education/teamName` to any additional code or example repos as repo admin
+- [ ] Added redirects for any moved or removed pages
+- [ ] Spell checked the tutorial(s)
+- [ ] Followed the [unified style guide](https://github.com/hashicorp/web-unified-docs/tree/main/docs/style-guide)
+- [ ] Linted code snippets (Details per language [here](https://github.com/hashicorp/engineering-docs/blob/master/writing/markdown.md#code-blocks))
+- [ ] Checked the steps for completeness (no steps are implied or hidden)
+- [ ] Looked at the local or vercel build and checked each new or changed page for:
+  - display on the product curriculum page
+  - callout box formatting
+  - code block highlighting
+  - right-hand navigation
+  - next and back buttons
+  - URL path

.github/pull_request_template.md

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+Please go to the `Preview` tab and select the appropriate template:
+
+* [HCP services](?expand=1&template=hcp_pull_request_template.md)
+* [Terraform Enterprise](?expand=1&template=ptfe_release_pull_request_template.md)