fix(API access): Update API from v2 to v5 and add API Version as env

[LennardZieglerCONPORT]

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

The currently used Wire-API version is v2. Needed to be changed to v5.

• Linear Ticket Url: https://linear.app/wire-integrations/issue/WIR-12/switch-from-wire-api-v2-to-wire-api-v5

Solutions

Added new environment variable to quickly change the API version in future issues. Used this variable to specify which API version to access.

Testing

How to Test

Check the network tab in the dev-tools to verify the selected API version.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

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