*** General Cmdlet Updates and Fixes

- Fix web cmdlets to properly construct URI from body when using `-NoProxy` (#14673)
- Fix `PromptForCredential()` to add `targetName` as domain (#14504)
- Clean up the IPC named pipe on PowerShell exit (#12187)

*** Tests

- Update markdown test packages with security fixes (#13730, #14145, #14454)

*** Build and Packaging Improvements

<details>

<summary>
Bump .NET SDK to version <code>3.1.407</code>
</summary>

<ul>
<li>Bump .NET to version 3.1.407 (Internal 14783)</li>
<li>Fix the miscellaneous analysis CI build (#14971, #14974, #14975)</li>
<li>Declare which variable group is used for checking the blob in the release build (#14970)</li>
<li>Use template that disables component governance for CI (#14938)</li>
<li>Suppress the warning for having multiple nuget feeds (#14893)</li>
<li>Disable codesign validation where the file type is not supported (#14885)</li>
<li>Make universal Deb package based on deb package spec (#14681)</li>
<li>Add manual release automation steps and improve changelog script (#14445)</li>
<li>Fix a typo in the <code>Get-ChangeLog</code> function (#14129)</li>
<li>Add validation and dependencies for <code>Ubuntu 20.04</code> distribution to packaging script (#13993)</li>
<li>Add comment in release-BuildJson.yml for date formatting</li>
<li>Install wget on centos-7 docker image</li>
<li>Fix install-dotnet download (#14856)</li>
<li>Fix release build to upload global tool packages to artifacts (#14620)</li>
<li>Fixes to release pipeline for GA release (#14034)</li>
<li>Add checkout step to release build templates (#13840)</li>
<li>Add flag to make Linux script publish to production repo (#13714)</li>
<li>Use new release script for Linux packages (#13705)</li>
<li>Change stage dependency for docker release stage in release pipeline (#13512)</li>
<li>Create the folder before copying the global tools (#13476)</li>
<li>A few fixes to the release pipeline (#13473)</li>
<li>Change the variable group name (Internal 12339)</li>
<li>Create release pipeline as a yaml pipeline (#13394)</li>
</ul>

</details>

[7.0.6]: https://github.com/PowerShell/PowerShell/compare/v7.0.5...v7.0.6