New $PSStyle.Formatting.CustomTableHeader decoration

[SteveL-MSFT]

Prerequisites

• [X] Write a descriptive title.
• [X] Search the existing issues.

Summary of the new feature or changed behavior

An additional $PSStyle.Formatting.CustomTableHeader is added to differentiate in the table header labels that don't match a property name. For example:

get-process pwsh

 NPM(K)    PM(M)      WS(M)     CPU(s)      Id  SI ProcessName
 ------    -----      -----     ------      --  -- -----------
      0     0.00      13.33       6.21    3500 …98 pwsh
      0     0.00      46.53       0.60   10967 …67 pwsh
      0     0.00      40.02      35.83   64003 …02 pwsh
      0     0.00      12.19      35.44   65597 …97 pwsh

The first 4 columns are not actual property names you can access on the process object. But users can get confused as they expect them to be accessible via dot-notation if they store the object in a variable or use select-object and doesn't find that property.

List of articles that need to be updated

• https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_ansi_terminals?view=powershell-7.2

Link to related PR in PowerShell/PowerShell repo

• https://github.com/PowerShell/PowerShell/pull/17346

Link to related Issues in PowerShell/PowerShell repo

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