`Assert-ElevatedUser`: Minor change to localization key name

[johlju]

Pull Request (PR) description

• Assert-ElevatedUser
  • Renamed the localized string key name and prepared the localized string file to be able to distinguish which key belong to which command.

This Pull Request (PR) fixes the following issues

None. Just cleanup.

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [ ] Documentation added/updated in README.md.
• [ ] Comment-based help added/updated for all new/changed functions.
• [x] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [x] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

Merging #86 (eadf5b3) into main (a26f4e4) will not change coverage. The diff coverage is n/a.

@@        Coverage Diff         @@
##           main   #86   +/-   ##
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  Coverage    90%   90%           
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  Files        28    28           
  Lines       544   544           
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  Hits        495   495           
  Misses       49    49           

Impacted Files	Coverage Δ
source/Public/Assert-ElevatedUser.ps1	100% <ø> (ø)