Remove header.ps1 and move the module requirements to the REST entry point

The oversized module design comment lived only in header.ps1. Drop the file and relocate the two #Requires statements (PowerShell 7.0 and Context 8.1.6) to the top of Invoke-ConfluenceRestMethod.ps1 — the core function that every command routes through — so the build still generates the manifest's RequiredModules and PowerShellVersion. The framework injects the default CmdletBinding/param header when header.ps1 is absent.

Author: MariusStorhaug

src/functions/public/API/Invoke-ConfluenceRestMethod.ps1

@@ -1,4 +1,7 @@
-function Invoke-ConfluenceRestMethod {
+#Requires -Version 7.0
+#Requires -Modules @{ ModuleName = 'Context'; RequiredVersion = '8.1.6' }
+
+function Invoke-ConfluenceRestMethod {
     <#
     .SYNOPSIS
         Call the Confluence REST API using a stored (or supplied) context.