fix: add requirements.txt and replace hardcoded paths in government example

[31groot]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
The government example had two issues:

1. No requirements.txt — contributors hit ModuleNotFoundError for
   torch, transformers, numpy, tqdm, and openai with no guidance.

2. Hardcoded absolute paths (/home/icyfeather/...) in 4 YAML files
   (2 benchmarkingjob.yaml, 2 testenv.yaml) making benchmarks non-runnable
   on any machine except the original developer's.

Both objective and subjective sub-examples are fixed.

Which issue(s) this PR fixes:
Fixes #563

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[31groot]

/assign @MooreZheng