fix(frontend): Remove double title on credentials input

[Pwuts]

• Follow-up on feat(platform): Simplify Credentials UX #8524
• Resolves Fix double title on Credentials input #8637

Changes 🏗️

• Add back condition to hide credentials input title in CustomNode:generateInputHandles
• Add title={schema.description} to <CredentialsInput> title element

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • Create a block for which a system API key is present: should hide both the input and the title
  • Create a block for which no credentials are present: should show both the input and the title

Example test plan

• Create from scratch and execute an agent with at least 3 blocks
• Import an agent from file upload, and confirm it executes correctly
• Upload agent to marketplace
• Import an agent from marketplace and confirm it executes correctly
• Edit an agent from monitor, and confirm it executes correctly

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