Take into account ContentType from Headers in WebCmdlets

[CarloToso]

PR Summary

• Currently we only check for -ContentType and we ignore -Headers @{Content-Type=...} after this PR we also check for ContentType in headers

• If we set both -ContentType and -Headers @{Content-Type=...} --> -ContentType is used

We will also have to change the documentation that documents this behaviour

PR Context

Fixes #19156

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: Invoke-WebRequest if no -ContentType check -Headers @{Content-Type=...} MicrosoftDocs/PowerShell-Docs#9851
• 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.
      • Issue filed:
    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
      • Issue filed:
    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).
      • Issue filed:

[pull-request-quantifier-deprecated]

This PR has 19 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Extra Small
Size       : +15 -4
Percentile : 7.6%

Total files changed: 2

Change summary by file extension:
.cs : +4 -3
.ps1 : +11 -1

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[iSazonov]

@CarloToso Please open new doc issue and add reference in the PR description.

[ghost]

🎉v7.4.0-preview.2 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes