Set up eFormidlingToken generation in appTemplate

[acn-sbuad]

Description

To communicate with the integration point for eFormidling a token is required. The app template needs to be extended to generate a valid eFormidling token for all requests set towards the integration point.

Considerations

• [x] Does the APIM subscriptionkey need to be included int he header as well ?
• [x] What should the header be named?

Acceptance criteria

• [x] Requests from an app to eFormidling integration point contain eFormidlingAccessToken.
• [x] Requests towards integration point should not reach the platform if accesstoken is not included

  Development tasks

• [x] Update eFormidlingClient to add the accessToken as a request header in all requests.
• [x] Update app template to generate eFormidling token and include it in all requests where eFormidlingClient is utilized.
• [x] Fix outdated certificate ofr integration point. Should we keep the current domain?
• [x] QA
• [x] Push final nugets
• [x] Update changelog for apptemplate
• [x] Manual test is complete (if relevant)

[jeevananthank]

regression test is complete with nuget: 4.22.0-alpha.1