Chore: Remove opentracing and use opentelemetry instead (#67200)

* remove opentracing and use otel instead

* add various samplers for jaeger

* remove useless test that is covered in otel now

* we do not need a struct there

* remove old tests

* restore tests that parse various configurations

* check errors in tests

* Update pkg/infra/tracing/tracing_test.go

fix typo

Co-authored-by: Sofia Papagiannaki <1632407+papagian@users.noreply.github.com>

* add test for both legacy and new config formats

* use named constants

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Co-authored-by: Sofia Papagiannaki <1632407+papagian@users.noreply.github.com>

pkg/services/pluginsintegration/config/tracing.go

@@ -11,7 +11,7 @@ import (
 // newTracingCfg creates a plugins tracing configuration based on the provided Grafana tracing config.
 // If OpenTelemetry (OTLP) is disabled, a zero-value OpenTelemetryCfg is returned.
 func newTracingCfg(grafanaCfg *setting.Cfg) (pCfg.Tracing, error) {
-	ots, err := tracing.ParseSettingsOpentelemetry(grafanaCfg)
+	ots, err := tracing.ParseSettings(grafanaCfg)
 	if err != nil {
 		return pCfg.Tracing{}, fmt.Errorf("parse settings: %w", err)
 	}