Merge helpers function from node, boost, python. (#2)

* setup boost helpers

* add ci for pull requests

* pester for ci

* resolving issue with pester 5

* remove Output flag

* check tests with 4 version

* try common tests variant

* added requires

* move to 5 version

* try to add assert module

* fix scope

* use new regex for python

* fix regex in tests

* Pester 4.10.1

* EnableExit

* fix synopsys

* fix creating tar archive

Co-authored-by: Dmitry Shibanov <v-dmshib@microsoft.com>
Co-authored-by: Maxim Lobanov <v-malob@microsoft.com>

clean-toolcache.ps1

@@ -0,0 +1,13 @@
+param (
+    [string] $ToolName
+)
+
+$targetPath = $env:AGENT_TOOLSDIRECTORY
+if ($ToolName) {
+    $targetPath = Join-Path $targetPath $ToolName
+}
+
+if (Test-Path $targetPath) {
+    Get-ChildItem -Path $targetPath -Recurse | Where-Object { $_.LinkType -eq "SymbolicLink" } | ForEach-Object { $_.Delete() }
+    Remove-Item -Path $targetPath -Recurse -Force
+}