Calling `Split-Array` only if `TotalJobCount` more than 1

[raandree]

Pull Request (PR) description

The redesign of Split-Array in #22 added new validation for parameter ChunkCount:

[ValidateRange(2, [long]::MaxValue)]
[int]
$ChunkCount,

Note: No changelog entry added as this should have been part of #22.

The method should only be called when the is more than one worker / job.

This Pull Request (PR) fixes the following issues

NA

Task list

• [ ] 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).
• [ ] Resource documentation added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] 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