Fix Job Summary disabled on self hosted machines

[EyalDelarea]

• [x] All tests passed. If this feature is not already covered by the tests, I added new tests.

• [x] I used npm run format for formatting the code before submitting the pull request.

The enableJobSummaries() function previously attempted to retrieve the temporary directory location using the os.RUNNER_TEMP environment variable. However, on self-hosted machines, this variable may be unset. This PR introduces a fallback to the system's default temporary directory when RUNNER_TEMP is not set.

Tests for this function have also been added.

[github-actions[bot]]

[](https://docs.jfrog-applications.jfrog.io/jfrog-applications/frogbot)

---

[🐸 JFrog Frogbot](https://docs.jfrog-applications.jfrog.io/jfrog-applications/frogbot)