[jaeger-v2] Use environment variables in Kafka config

[mahadzaryab1]

Which problem is this PR solving?

• Resolves #6027

Description of the changes

• Leverages the functionality added in https://github.com/open-telemetry/opentelemetry-collector/issues/5228 to remove the logic for rewriting the config and simply setting an environment variable for the Kafka integration tests.

How was this change tested?

• The change is to an integration test so the CI passing is a good test for this change

Checklist

• [x] I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• [x] I have signed all commits
• [x] I have added unit tests for the new functionality
• [x] I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.92%. Comparing base (be48a84) to head (7be814a). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6028 +/- ## ========================================== + Coverage 96.90% 96.92% +0.01% ========================================== Files 349 349 Lines 16599 16599 ========================================== + Hits 16086 16088 +2 + Misses 329 328 -1 + Partials 184 183 -1 ``` | [Flag](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6028/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | Coverage Δ | | |---|---|---| | [badger_v1](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6028/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `7.98% <ø> (ø)` | | | [badger_v2](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6028/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `1.81% <ø> (ø)` | | | 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