testifylint: enable go-require

[mmorel-35]

Which problem is this PR solving?

• Apply go-require 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

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.78%. Comparing base (55d330b) to head (6425bfd). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/agent/app/testutils/mock_grpc_collector.go	0.00%	1 Missing :warning:

Additional details and impacted files

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