🐛 CDK: Fix DNS resolution error handling

[devin-ai-integration]

Fix DNS resolution error handling in CDK to properly handle temporary DNS failures.

Fixes: airbytehq/airbyte-internal-issues#11320

Changes:

• Update default error mapping to treat InvalidURL as transient error
• Add unit tests for DNS error handling
• Remove need for custom error handlers in connectors

Current Implementation:
Both Klaviyo and LinkedIn Ads connectors implement custom error handlers for DNS resolution issues:

• Klaviyo: https://github.com/airbytehq/airbyte/blob/master/airbyte-integrations/connectors/source-klaviyo/source_klaviyo/components/klaviyo_error_handler.py#L16-L25
• LinkedIn Ads: https://github.com/airbytehq/airbyte/blob/master/airbyte-integrations/connectors/source-linkedin-ads/source_linkedin_ads/components.py#L308-L318

This change centralizes that handling in the CDK to ensure consistent behavior across all connectors.

Link to Devin run: https://app.devin.ai/sessions/6b54ed98f6e84226b1f5a7cb2d1a941d

Requested by: AJ (@aaronsteers)

[devin-ai-integration]

🤖 Devin AI Engineer

Original prompt from Aaron:

Received message in Slack channel #ask-devin-ai:

@Devin - Can you help me get started on this issue? <https://github.com/airbytehq/airbyte-internal-issues/issues/11320>

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add "(aside)" to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring

[devin-ai-integration]

Closing in favor of #360 which takes a better approach by introducing DNSResolutionError