feat(frontend): Show toast on low credit balance, rename Credits page to Billing

[kcze]

Changes 🏗️

• If a node fails to execute and error contains Insufficient balance show toast with link to Billing page
• Rename Credits page to Billing

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
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  • ...

Example test plan

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[majdyz]

LGTM but can we match the insufficient balance? I think it would be better middle ground.