Remove sanitizer/service_name_sanitizer (dead code) (#7366)

## Which problem is this PR solving?
- Resolves part of #7261 

## Description of the changes
- When introduced: PR #67
- when replaced:
  - First Replacement - PR #3631
  - modern OTLP implementation - PR #6077
  - final location - PR #7158
- Current State:
  - Old-dead `cmd/collector/app/sanitizer/service_name_sanitizer.go`
- Legacy-used
`cmd/collector/app/sanitizer/empty_service_name_sanitizer.go`
  - Modern-used `internal/jptrace/sanitizer/emptyservicename.go`
- No prod usage
- Files to remove:
  - `cmd/collector/app/sanitizer/service_name_sanitizer.go`
  - `cmd/collector/app/sanitizer/service_name_sanitizer_test.go`

## 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
- [x] I have run lint and test steps successfully
  - for `jaeger`: `make lint test`
  - for `jaeger-ui`: `npm run lint` and `npm run test`

Signed-off-by: Parship Chowdhury <i.am.parship@gmail.com>
Co-authored-by: Yuri Shkuro <yurishkuro@users.noreply.github.com>

Author: Parship Chowdhury