test: add linux job user override tests

[YutongLi291]

What was the problem/requirement? (What/Why)

Users are able to boot up the linux worker agent with custom job override users rather than using the default job-user. This will make sure that jobs are ran with the custom overridden user.

We should make sure this functionality works as expected and there are no regressions.

What was the solution? (How)

Add WA E2E test cases that verify that the job user can be overridden through the config or the env variable on Linux

What is the impact of this change?

Prevention of regressions in functionality allowing customers to override the job user.

How was this change tested?

# Linux
source .e2e_linux_infra.sh
hatch run e2e-test

# Windows
source .e2e_windows_infra.sh
hatch run e2e-test

31 passed, 6 skipped, 5 warnings in 3099.93s (0:51:39)
Tested over 10 times to verify that it is not flaky.

Was this change documented?

No

Is this a breaking change?

No

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud