feat(blocks/jina): Add default credentials for Jina

[aarushik93]

We want to provide jina by default on our platform

Changes 🏗️

Added Jina credentials to all the default settings in store.py.
Added a jina cost filter in credit.py

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:
  • ...

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

For configuration changes:

• .env.example is updated or already compatible with my changes
• docker-compose.yml is updated or already compatible with my changes
• I have included a list of my configuration changes in the PR description (under Changes)

Examples of configuration changes

• Changing ports
• Adding new services that need to communicate with each other
• Secrets or environment variable changes
• New or infrastructure changes such as databases

[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 Security concerns API Key Exposure: The PR adds handling for a new Jina API key. While the key itself is stored securely using SecretStr, verify that the key is properly protected in all contexts where it's used and that it's not accidentally logged or exposed in error messages.

⚡ Recommended focus areas for review Cost Filter Change The SearchTheWebBlock cost filter was changed from a simple cost amount to include Jina credentials. This change should be validated to ensure it doesn't break existing functionality or billing.

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