ci: [k6-test] Update k6-load-test.yml for new AWS setup

[2403905]

Moving from the old Hetzner hosted machines to a new AWS setup with a single self-hosted Github worker.

Description

Related Issue

• Fixes:
• #PANAMA-538
• #OCISDEV-1381

Motivation and Context

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[kw-security]

✅ Snyk checks have passed. No issues have been found so far.

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✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[LukasHirt]

Why duplicate #12817 here?

[2403905]

Why duplicate #12817 here?

Because it's easy to work with the branch in this case.