fix: CI - Corrected test wording (Azure#6464)

## Description

Corrected the test's 'Conditional parameters' & UDT's description should
contain 'Required if' followed by the condition making the parameter
required.' _because_ block as it currently asks to **not** specify the
reason (which is not only incorrect, but also conflicts with the test's
title).

## Type of Change

<!-- Use the checkboxes [x] on the options that are relevant. -->

- Azure Verified Module updates:
- [ ] Bugfix containing backwards-compatible bug fixes, and I have NOT
bumped the MAJOR or MINOR version in `version.json`:
- [ ] 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
- [x] Update to CI Environment or utilities (Non-module affecting
changes)

---------

Co-authored-by: Erika Gressi <56914614+eriqua@users.noreply.github.com>

Author: AlexanderSehr

utilities/pipelines/staticValidation/compliance/module.tests.ps1

@@ -992,7 +992,7 @@ Describe 'Module tests' -Tag 'Module' {
                         }
                     }
                 }
-                $incorrectParameters | Should -BeNullOrEmpty -Because ('conditional parameters in the template file should lack a description that starts with "Required.". Found incorrect items: [{0}].' -f ($incorrectParameters -join ', '))
+                $incorrectParameters | Should -BeNullOrEmpty -Because ('the description of conditional parameters in the template file must contain a sentence that starts with "Required if", explaining when the parameter is mandatory. Found incorrect items: [{0}].' -f ($incorrectParameters -join ', '))
             }
 
             It '[<moduleFolderName>] All non-required parameters & UDTs in template file should not have description that start with "Required.".' -TestCases $moduleFolderTestCases {