Fix mock of Cline.abort in tests

[mrubens]

Getting occasional failures in Cline.test.ts otherwise

/home/runner/work/Roo-Code/Roo-Code/src/core/Cline.ts:655
        this.abort = true;
                   ^

TypeError: Cannot set property abort of #<Cline> which has only a getter
    at Cline.abortTask (/home/runner/work/Roo-Code/Roo-Code/src/core/Cline.ts:750:13)
    at Cline.recursivelyMakeClineRequests (/home/runner/work/Roo-Code/Roo-Code/src/core/Cline.ts:2956:11)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at Cline.initiateTaskLoop (/home/runner/work/Roo-Code/Roo-Code/src/core/Cline.ts:721:23)
    at Cline.startTask (/home/runner/work/Roo-Code/Roo-Code/src/core/Cline.ts:474:3)

---

Important

Fixes mock of abort property in Cline.test.ts by adding a setter to prevent test failures.

• Tests:
  • Fixes mock of abort property in Cline.test.ts by adding a setter to prevent test failures due to abort being a getter-only property.

^{This description was created by for d6e7750. It will automatically update as commits are pushed.}

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