Drop ScheduledTransactionTrace check

[Stephan202]

Suggested commit message:

Drop `ScheduledTransactionTrace` check (#788)

As well as any other references to New Relic.

❗ Before merging this, we should validate that Datadog does indeed collect traces for @Scheduled transactions out of the box.

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[Stephan202]

Rebased and resolved conflict.

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[mohamedsamehsalah]

LGTM apart from the validating that Datadog does indeed collect traces for @scheduled transactions out of the box comment.

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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0.0% Duplication

[Stephan202]

Before merging this, we should validate that Datadog does indeed collect traces for @Scheduled transactions out of the box.

While I didn't test this in production, the agent source code does have a test case for this. So I expect this'll work fine. If not, we'll review how to deal with that.