chore: Terraform OIDC

[algattik]

What this PR changes/adds

Authenticate Terraform to ARM using Service Principal with Open ID Connect instead of Service Principal with a Client Secret

Why it does that

This simplifies setup and increases security.

Further notes

Support for OpenID Connect was added in version 3.7.0 of the Terraform AzureRM provider.

Linked Issue(s)

Closes https://github.com/eclipse-dataspaceconnector/MinimumViableDataspace/issues/78

Checklist

• [ ] added appropriate tests?
• [ ] performed checkstyle check locally?
• [ ] added/updated copyright headers?
• [ ] documented public classes/methods?
• [ ] added/updated relevant documentation?
• [ ] added relevant details to the changelog? (skip with label no-changelog)
• [ ] formatted title correctly?

[github-actions[bot]]

Unit Test Results

  7 files  ±0    7 suites  ±0   44s :stopwatch: +8s 28 tests ±0  27 :heavy_check_mark: ±0  1 :zzz: ±0  0 :x: ±0  31 runs  ±0  30 :heavy_check_mark: ±0  1 :zzz: ±0  0 :x: ±0 

Results for commit 12b067f6. ± Comparison against base commit ce8de659.

:recycle: This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Base: 78.78% // Head: 78.78% // No change to project coverage :thumbsup:

Coverage data is based on head (5704f25) compared to base (ce8de65). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #280 +/- ## ========================================= Coverage 78.78% 78.78% Complexity 20 20 ========================================= Files 5 5 Lines 66 66 Branches 5 5 ========================================= Hits 52 52 Misses 14 14 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=agera-edc). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=agera-edc)

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