fix: update copyright template to use custom format with dynamic year

[devin-ai-integration]

This PR updates the copyright template to use the current year dynamically while maintaining the exact format requested:

Copyright (c) XXXX Airbyte, Inc., all rights reserved.

Changes made:

1. Created a custom LICENSE_TEMPLATE file with the exact format requested
2. Created a shell script that uses addlicense with the template and dynamically inserts the current year
3. Updated pre-commit hooks to use this script instead of direct addlicense commands

This approach ensures that all new files automatically get the current year in their copyright headers with the exact format requested, eliminating the need for manual updates in the future.

Requested by: [email protected]

Link to Devin run: https://app.devin.ai/sessions/4822a406bb3a42d9915a7cc2a9cdf3c8

[devin-ai-integration]

🤖 Devin AI Engineer

Original prompt from [email protected]:

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

@Devin There is a template somewhere in the code that sets at the top of our source file the following: `Copyright (c) 2024 Airbyte, Inc., all rights reserved.` Right now, it looks like it is hardcoded to 2024. and even now (is 2025) stills sets the year to 2024. please help me update that template to set that based on the current year

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[devin-ai-integration]

Closing as requested by Francis Genet