Generalize CLI system tests for jobs to support more environments

[t1m0thyj]

1. Cancel Jobs system test assumes job ID is one less than most recently submitted job

   The jobid should be accessible here - I believe it was created by the submit_job.sh script on line 58.

   Could we grab the jobid from there rather than assuming it is one less?

   Originally posted by @t1m0thyj in System tests should cleanup after themselves #2216 (comment)

   zowe-cli/packages/cli/__tests__/zosjobs/__system__/cancel/cli.zos-jobs.cancel.job.system.test.ts

   Lines 63 to 65 in 201ecc1

   	// Calculate the previous job ID (one less) - jobid created by test before, inaccessible until now
   	const jobidNumber = parseInt(jobid.replace('JOB', ''), 10); //Extract the numeric part of the job ID
   	const previousJobid = 'JOB' + String(jobidNumber - 1).padStart(5, '0'); // then decrement by 1, assuming 5 digits in the job ID

2. Search Jobs system test has hardcoded job name
   

   zowe-cli/packages/cli/__tests__/zosjobs/__system__/search/cli.zos-jobs.search.job.test.ts

   Line 42 in 024d0dc

   JOB_NAME = REAL_SESSION.ISession.user.substring(0, JOB_LENGTH).toUpperCase() + "SF";

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