fix(libsql-driver): handle optional job data in saveJob function

[CorentinTh]

No description provided.

[Copilot]

Pull Request Overview

Fix an issue in the libsql driver where scheduling jobs without data would cause problems due to improper handling of undefined/null job data during JSON serialization.

• Modified the saveJob function in the libsql driver to handle optional job data properly by checking for existence before JSON.stringify
• Added test coverage for scheduling jobs without data in both scheduled and periodic job scenarios

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/driver-libsql/src/driver.ts	Fixed data serialization to handle null/undefined job data
packages/test-suites/tests/suites/scheduled-jobs.test.ts	Added test for scheduling jobs without data
packages/test-suites/tests/suites/periodic-jobs.test.ts	Added test for periodic jobs without task data
.changeset/strong-hats-brake.md	Added changeset documenting the fix

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