fix(pwsh): wrap keyhandlers in try/finally

[JanDeDobbeleer]

Prerequisites

• I have read and understood the contributing guide.
• The commit message follows the conventional commits guidelines.
• Tests for the changes have been added (for bug fixes / features).
• Docs have been added/updated (for bug fixes / features).

Description

🤖 Generated by Copilot at 5a9632f

Fix transient prompt bug and improve code style in omp.ps1 script. The script now handles errors and breakpoints more gracefully and is easier to read.

How

🤖 Generated by Copilot at 5a9632f

• Fix a bug where the transient prompt would not be restored after an error or a breakpoint in the debugger by adding a try-finally block around the script blocks for the Enter and Ctrl+c key handlers in omp.ps1 (link)
• Improve the readability and consistency of the code in the Enter key handler by adding a blank line before and after the call to [Microsoft.PowerShell.PSConsoleReadLine]::AcceptLine() in omp.ps1 (link)