Retrieving job_id should be a method instead of a property

[pandasa123]

Description

Currently, if a user wants to fetch their job_id for reference, they can retrieve it with the job.job_id property. This is inconsistent with Qiskit Runtime, where the expected interface is job.job_id(), as a method.

Additionally, when the job_id is printed out, it has quotes. This is inconsistent with Runtime, without quotes

Acceptance Criteria

• I should be able to use job.job_id() to fetch my job's id
• My returned job_id should not have quotes