Restore markdownlint tests (#12549)

Co-authored-by: Travis Plunk <travis.plunk@microsoft.com>

.github/ISSUE_TEMPLATE/Bug_Report.md

@@ -20,25 +20,25 @@ This repository is **ONLY** for PowerShell Core 6 and PowerShell 7+ issues.
 
 -->
 
-# Steps to reproduce
+## Steps to reproduce
 
 ```powershell
 
 ```
 
-# Expected behavior
+## Expected behavior
 
 ```none
 
 ```
 
-# Actual behavior
+## Actual behavior
 
 ```none
 
 ```
 
-# Environment data
+## Environment data
 
 <!-- provide the output of $PSVersionTable -->
 

.github/ISSUE_TEMPLATE/Distribution_Request.md

@@ -7,24 +7,24 @@ assignees: ''
 
 ---
 
-# Details of the Distribution
+## Details of the Distribution
 
-- Name of the Distribution: 
+- Name of the Distribution:
 - Version of the Distribution:
 - Package Types
-  - [ ] Deb
-  - [ ] RPM
-  - [ ] Tar.gz
-  - Snap - Please file issue in https://github.com/powershell/powershell-snap.  This issues type is unrelated to snap packages with a distribution neutral.
-- Processor Architecture (One per request): 
+    - [ ] Deb
+    - [ ] RPM
+    - [ ] Tar.gz
+    - Snap - Please file issue in https://github.com/powershell/powershell-snap.  This issues type is unrelated to snap packages with a distribution neutral.
+- Processor Architecture (One per request):
 - [ ] **Required** - An issues has been filed to create a Docker image in https://github.com/powershell/powershell-docker
 - The following is a requirement for supporting a distribution **without exception.**
-  - [ ] The version and architecture of the Distribution is [supported by .NET Core](https://github.com/dotnet/core/blob/master/release-notes/3.0/3.0-supported-os.md#linux).
+    - [ ] The version and architecture of the Distribution is [supported by .NET Core](https://github.com/dotnet/core/blob/master/release-notes/3.0/3.0-supported-os.md#linux).
 - The following are requirements for supporting a distribution.
-  Please write a justification for any exception where these criteria are not met and 
+  Please write a justification for any exception where these criteria are not met and
   the PowerShell committee will review the request.
-  - [ ] The version of the Distribution is supported for at least one year.
-  - [ ] The version of the Distribution is not an [interim release](https://ubuntu.com/about/release-cycle) or equivalent.
+    - [ ] The version of the Distribution is supported for at least one year.
+    - [ ] The version of the Distribution is not an [interim release](https://ubuntu.com/about/release-cycle) or equivalent.
 
 ## Progress - For PowerShell Team **ONLY**
 

.github/ISSUE_TEMPLATE/Feature_Request.md

@@ -7,7 +7,7 @@ assignees: ''
 
 ---
 
-# Summary of the new feature/enhancement
+## Summary of the new feature/enhancement
 
 <!-- 
 A clear and concise description of what the problem is that the new feature would solve.
@@ -15,7 +15,7 @@ Try formulating it in user story style (if applicable):
 'As a user I want X so that Y.' with X being the being the action and Y being the value of the action.
 -->
 
-# Proposed technical implementation details (optional)
+## Proposed technical implementation details (optional)
 
 <!-- 
 A clear and concise description of what you want to happen.

.github/ISSUE_TEMPLATE/Release_Process.md

@@ -12,7 +12,7 @@ This template is for maintainers to create an issues to track the release proces
 Please **only** use this template if you are a maintainer.
 -->
 
-# Release Process for v6.x.x
+## Checklist
 
 - [ ] Verify that `PowerShell-Native` has been updated/released as needed.
 - [ ] Check for `PowerShellGet` and `PackageManagement` release plans.

.github/ISSUE_TEMPLATE/Security_Issue_Report.md

@@ -7,7 +7,7 @@ assignees: 'TravisEz13'
 
 ---
 
-# Security Issue
+## Security Issue
 
 Excerpt from [Issue Management - Security Vulnerabilities](https://github.com/PowerShell/PowerShell/blob/master/.github/SECURITY.md)