ci[patch]: fix unit-tests-integrations by implementing dynamic matrix strategy.

[rameshkrishna]

• get-changed-files: Determines the files changed in the latest commit.
• prepare-matrix: Generates a matrix strategy for packages that have changed and need testing.
• unit-tests: Runs the unit tests for the identified packages on Node.js versions 18 and 20 incase of no changes in unit test jobs is skipped and whole workflow gets marked as success.

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[bracesproul]

What issue is this fixing? @rameshkrishna

[rameshkrishna]

Hey @bracesproul,

This PR addresses the unit tests langchain integrations workflow failures caused by the changes introduced in PR ci[patch]: Only run CI testing if specific package touched 5733.

Failures in this github workflow : https://github.com/langchain-ai/langchainjs/actions/workflows/unit-tests-integrations.yml

Here is the error message when the above work flow is triggered

Annotations

1 error

Invalid workflow file: .github/workflows/unit-tests-integrations.yml#L59The workflow is not valid. .github/workflows/unit-tests-integrations.yml (Line: 59, Col: 9): Unrecognized named-value: 'matrix'. Located at position 1 within expression: matrix.packageShow less -- Annotations 1 error [Invalid workflow file: .github/workflows/unit-tests-integrations.yml#L59](https://github.com/langchain-ai/langchainjs/actions/runs/9488089685/workflow) The workflow is not valid. .github/workflows/unit-tests-integrations.yml (Line: 59, Col: 9): Unrecognized named-value: 'matrix'. Located at position 1 within expression: matrix.package

[rameshkrishna]

More details here #5812

[jacoblee93]

CC @bracesproul is this still needed?