[Modules]: Bug fix for Automation account using uniqueString() instead of newGuid() for the job schedule name

[ahmadabdalla]

Description

Closes #1792

Recent change from the newGuid() to the uniqueString() function does not generate a new GUID for the job schedule child resource. More details is described in the issue.

Pipeline references

Pipeline

Type of Change

Please delete options that are not relevant.

• Bugfix (non-breaking change which fixes an issue)

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code

[ahmadabdalla]

This PR should support #1790