[Eng] Fixed data plane suffix in Linux system

[VeryEarly]

Description

• Linux file system is case sensitive
• there are 2 sources of name while building, one is from path src/root/nameData.Autorest, the other is from src/root/nameData.Autorest\README.md = namedata
• for folder name under generated, we need name 1
• for generated files like psd1/psm1/format.ps1xml/csproj, we need the name 2
• PowerShell has odd behavior: say we have file 'src/Az.Namedata.psd1', and do cp src/Az.NameData.psd1 generated, you end up get src/Az.NameData.psd1 not src/Az.Namedata.psd1
  Polish scripts to satisfy linux

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

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[Copilot]

Pull Request Overview

This PR updates the Update-GeneratedSubModule script to correctly handle case-sensitive Linux file systems by dynamically detecting module filenames (psd1, psm1, format, csproj) instead of using hard-coded names.

• Replaces static PSD1 lookup with Get-ChildItem pattern matching
• Builds fileToUpdate array dynamically from source folder contents
• Adjusts csproj generation to use the detected project filename and preserve GUID

Comments suppressed due to low confidence (3)

tools/BuildScripts/BuildScripts.psm1:177

• [nitpick] The variable name $cSubModuleNameTrimmed is not immediately clear; consider renaming it to something like $csprojSubModuleName for better readability.

    $cSubModuleNameTrimmed = $subModuleNameTrimmed

tools/BuildScripts/BuildScripts.psm1:135

• Using Get-ChildItem without restricting to a single result may return multiple matches; consider selecting Select-Object -First 1 or validating that exactly one file is found to avoid unintended behavior.

    $psd1Name = Get-ChildItem $GeneratedDirectory | Where-Object { $_.Name -match "Az\.${subModuleNameTrimmed}\.psd1" } | Foreach-Object {$_.Name}

tools/BuildScripts/BuildScripts.psm1:169

• Include a filter to remove any null or empty entries from $fileToUpdate (e.g., @(... ) | Where-Object { $_ }) to prevent errors when a file name variable didn't match any items.

    $fileToUpdate = @('generated', 'resources', $psd1Name, $psm1Name, $formatName, 'exports', 'internal', 'test-module.ps1', 'check-dependencies.ps1')