Feature/irs: Make IRS compatible to the dpp-backend

[saudkhan116]

Why we create this PR?

• Added apiKey to the api request headers in backend and in helm charts
• Added IrsShell class to parse the IRS JobResponse payload
• Update DigitalTwin references with IrsShell to TreeManager class to retrieve child components
• Update unit tests to IrsService

What we want to achieve with this PR?

To make IRS drill down to work with the new EDC 0.7.0

What is new?

Updated

• Added apiKey to the api request headers in backend and in helm charts
• Added IrsShell class to parse the IRS JobResponse payload
• Update DigitalTwin references with IrsShell to TreeManager class to retrieve child components
• Update unit tests to IrsService

PR Linked to:

PR #327
Issue #266