🩹 [Patch]: Encode all PowerShell files using UTF8 with BOM (#118)

## Description

This pull request makes a minor change to the `Planets.ps1` files in
both test repositories. The only update is the addition of a Unicode
Byte Order Mark (BOM) at the beginning of each file to ensure proper
encoding.

- Added a Unicode BOM to the start of `Planets.ps1` in both
`srcTestRepo` and `srcWithManifestTestRepo` to enforce UTF-8 encoding.

Author: MariusStorhaug

tests/srcTestRepo/src/variables/public/Planets.ps1

@@ -1,4 +1,4 @@
-$script:Planets = @(
+$script:Planets = @(
     @{
         Name      = 'Mercury'
         Mass      = 0.330

tests/srcWithManifestTestRepo/src/variables/public/Planets.ps1

@@ -1,4 +1,4 @@
-$script:Planets = @(
+$script:Planets = @(
     @{
         Name      = 'Mercury'
         Mass      = 0.330