ComputerManagementDsc: Update CI pipeline files

[johlju]

Pull Request (PR) description

Added

• ComputerManagementDsc
  • Added build task Generate_Conceptual_Help to generate conceptual help for the DSC resource.
  • Added build task Generate_Wiki_Content to generate the wiki content that can be used to update the GitHub Wiki.

Changed

• ComputerManagementDsc
  • Updated CI pipeline files.
  • No longer run integration tests when running the build task test, e.g. .\build.ps1 -Task test. To manually run integration tests, run the following:

    .\build.ps1 -Tasks test -PesterScript 'tests/Integration' -CodeCoverageThreshold 0

This Pull Request (PR) fixes the following issues

None

Task list

• [x] Added an entry under the Unreleased section of the change log in the CHANGELOG.md. Entry should say what was changed, and how that affects users (if applicable).
• [ ] Resource documentation added/updated in README.md in resource folder.
• [ ] Resource parameter descriptions added/updated in schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Resource Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• [x] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[PlagueHO]

Will get onto these tonight @johlju - sorry about the delay!

[PlagueHO]