Fix changelog content grab during GitHub release

[jshigetomi]

PR Summary

This pull request includes a significant change to the jobs: section in the .pipelines/templates/release-githubtasks.yml file. The change involves modifying the way the changelog content is selected based on version headings.

Changelog content selection:

• .pipelines/templates/release-githubtasks.yml: Updated the method to identify and select changelog content by using a pattern to find version headings and determining the start and end lines based on these headings. This improves the accuracy and reliability of extracting the relevant changelog section.

PR Context

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: or [ WIP ] to the beginning of the title (the WIP bot will keep its status check at Pending while the prefix is present) and remove the prefix when the PR is ready.
• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    - [ ] Issue filed:
• Testing - New and feature
  • N/A or can only be tested interactively
  • OR
  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
  • I have considered the user experience from a tooling perspective and opened an issue in the relevant tool repository. This may include:
    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode
      (which runs in a different PS Host).
      • Issue filed:
    • Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
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    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
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    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).
      • Issue filed:

[jshigetomi]

/azp run PowerShell-CI-macos, PowerShell-CI-Linux, PowerShell-CI-Windows, PowerShell-Windows-Packaging-CI, PowerShell-CI-static-analysis, PSResourceGet ACR

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