feat: Removed explicit 'latest' pwsh installation for Set-EnvironmentOnAgent script

[AlexanderSehr]

Description

• Removed explicit 'latest' pwsh installation for Set-EnvironmentOnAgent script
• The original issue was rooted in an issue with pwsh version 7.2.9 which was fixed fast, but the version not updated on the agents for the longest time. Now, the pre-installed pwsh version is 7.4.*, rendering the installation redundant (and could actually lead to issues)

Pipeline Reference

Pipeline
(unrelated WAF)
(unrelated WAF)
(unrelated WAF + broken template)
(unrelated WAF)

Type of Change

• Update to CI Environment or utilities (Non-module affecting changes)
• Azure Verified Module updates:
  • Bugfix containing backwards-compatible bug fixes, and I have NOT bumped the MAJOR or MINOR version in version.json:
    • Someone has opened a bug report issue, and I have included "Closes #{bug_report_issue_number}" in the PR description.
    • The bug was found by the module author, and no one has opened an issue to report it yet.
  • Feature update backwards compatible feature updates, and I have bumped the MINOR version in version.json.
  • Breaking changes and I have bumped the MAJOR version in version.json.
  • Update to documentation

[eriqua]

🆗

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