Revert "Add usr\bin\ to path on windows"

This reverts commit 50aa0031a4.

Reason for revert: Change replaces PATH and causes some built-in
commands to be replaced with breaking Git equivalents.

Change-Id: I9e25238c8f84cfc5ad44e1cdfb0a0fe33a60dcfe
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

coin/provisioning/common/windows/bin_to_path.ps1

@@ -1,4 +0,0 @@
-if (-not ($env:PATH -split ';' | Where-Object { $_ -eq "C:\Program Files\Git\usr\bin" })) {
-    & setx PATH "C:\Program Files\Git\usr\bin"
-    Write-Host "Added C:\Program Files\Git\usr\bin to PATH."
-}

coin/provisioning/qtci-windows-10_22H2-x86_64/09-bin-to-path.ps1

@@ -1 +0,0 @@
-. "$PSScriptRoot\..\common\windows\bin_to_path.ps1"

coin/provisioning/qtci-windows-11_22H2-x86_64/09-bin-to-path.ps1

@@ -1 +0,0 @@
-. "$PSScriptRoot\..\common\windows\bin_to_path.ps1"