chore: fix service management in scripts/run-tests (#15211)

## Description

When running `scripts/run-tests --venv <hash>` the script would not
auto-start docker services or add `DD_TRACE_AGENT_URL` env var.

This fixes that.

Apologies, the noise is because I ran formatting on the file.

## Testing

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## Risks

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-->

## Additional Notes

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Author: brettlangdon