chore: studiogateway -> gateway

[martinothamar]

Description

just naming to be consistent with other runtime components.
need to be deployed during off-hours as some downtime can happen due to ks and resources being recreated with different names (which are separate deletions and creations)

Verification

• Related issues are connected (if applicable)
• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/studiogateway-to-gateway

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[mlqn]

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