test: add unit tests for Tasker class

[ThyMinimalDev]

What does this PR do?

Adds comprehensive unit tests for the Tasker class in packages/lib/tasker/Tasker.ts, focusing on:

• Verifying that parameters are properly passed to tasker methods
• Testing the fallback behavior when the async tasker fails (sync tasker should be invoked with the same params)
• Error handling when both async and sync taskers fail

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - test-only changes
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

Run the tests with:

TZ=UTC yarn test packages/lib/tasker/Tasker.test.ts

All 11 tests should pass:

• 6 tests for async tasker enabled scenarios (param passing, fallback behavior)
• 3 tests for async tasker disabled scenarios (missing env vars)
• 2 tests for error handling edge cases

Checklist

• My code follows the style guidelines of this project
• I have checked if my changes generate no new warnings

Human Review Checklist

• Verify the mocks for @trigger.dev/sdk, ../constants, and ../redactError accurately represent the real dependencies
• Confirm the dynamic import pattern (await import("./Tasker")) is appropriate for testing module-level state that depends on env vars
• Check that process.env manipulation in tests is properly cleaned up in afterEach

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Link to Devin run: https://app.devin.ai/sessions/628cc1149911452e91286c24b905eb3d
Requested by: @ThyMinimalDev

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