Check if modules are already loaded before importing

[Copilot]

MicroBurst.psm1 used Get-InstalledModule to gate module imports, which fails for manually-loaded modules (not installed via PowerShellGet), causing MicroBurst functions to silently not load.

Changes

• MicroBurst.psm1: Wrap each module's Get-InstalledModule + Import-Module block in a Get-Module check for Az, AzureAD, AzureRM (commented section), and msonline

# Before: skips if not installed via PowerShellGet, even if already loaded
Get-InstalledModule -ErrorAction Stop -Name Az | Out-Null
Import-Module Az -ErrorAction Stop

# After: bypass install check if module is already in session
if (-not (Get-Module -Name Az)) {
    Get-InstalledModule -ErrorAction Stop -Name Az | Out-Null
    Import-Module Az -ErrorAction Stop
}

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