275171: Multiple project ManifestPath

[rajeshkaremane]

What this PR does / why we need it:

A brief description of changes being made
*Link to the relevant work items: *
AB#275171

Special notes for your reviewer

Any specific actions or notes on review?
Enabled looping thru multiple manifest file path
Line 53:
https://github.com/defra-adp-sandpit/adp-backend-template-dotnet/blob/main/.azuredevops/build.yaml

Testing

Any relevant testing information and pipeline runs.

https://dev.azure.com/defragovuk/DEFRA-FFC/_build?definitionId=6896

multiple manifest files
https://dev.azure.com/defragovuk/DEFRA-FFC/_build/results?buildId=558641&view=results

Checklist (please delete before completing or setting auto-complete)

• Story Work items associated (not Tasks)
• Successful testing run(s) link provided
• Title pattern should be {work item number}: {title}
• Description covers all the changes in the PR
• This PR contains documentation
• This PR contains tests

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