Improvements and corrections to Set-ToolsRepo and additional formatting.

[calcobia]

This PR closes #

The changes in this PR are as follows:

• Fixed null variable checks in Set-ToolsRepo function.
• Improved version check with semantic version comparison instead of lexicographical comparison.
• Fixed path error that prevented files from being copied.
• Additional error handling
• General formatting

I have read the contributor guidelines and have completed the following:

• Formatted the code using VSCode default formatter for PowerShell.
• Tested the code end-to-end against an SDDC.
• Documented the functions using standard PowerShell markup and applied AVSAttribute to newly exported functions.

[calcobia]

Before - A simple string comparison

$OldVersion = "10.9.30"
$NewVersion = "10.10.30"
If ($NewVersion -ge $OldVersion) {"New version is newer."} else {"New version is older"}
New version is older
Returns the wrong result.

Now - Semantic version comparison

$OldVersion = [System.Version]::Parse("10.9.30")
$NewVersion = [System.Version]::Parse("10.10.30")
If ($NewVersion -ge $OldVersion) {"New version is newer."} else {"New version is older"}
New version is newer.
Returns the correct result.