testifylint: enable float-compare

[mmorel-35]

Which problem is this PR solving?

• Apply float-compare rule of testifylint

Description of the changes

• More appropriate testify API with clearer failure message.

How was this change tested?

• CI

Checklist

• [x] I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• [x] I have signed all commits
• [ ] I have added unit tests for the new functionality
• [ ] 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 96.81%. Comparing base (0824fc2) to head (47f5ab3). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5989 +/- ## ========================================== - Coverage 96.82% 96.81% -0.02% ========================================== Files 345 345 Lines 16523 16523 ========================================== - Hits 15998 15996 -2 - Misses 339 340 +1 - Partials 186 187 +1 ``` | [Flag](https://app.codecov.io/gh/jaegertracing/jaeger/pull/5989/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/5989/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `8.02% <ø> (ø)` | | | [badger_v2](https://app.codecov.io/gh/jaegertracing/jaeger/pull/5989/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `1.82% <ø> (ø)` | | | 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