fix(prometheus_scrape): federate query match url building

[sainad2222]

Summary

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

How did you test this PR?

sources:
  prom_source:
    endpoints:
      - "http://localhost:9090/federate"
    honor_labels: true
    scrape_interval_secs: 60
    scrape_timeout_secs: 45
    query:
      match:
        - '{job="node"}'
    tls:
      verify_certificate: false
      verify_hostname: false
    type: prometheus_scrape

sinks:
  output:
    type: "console"
    inputs: ["prom_source"]
    target: "stdout"
    encoding:
      codec: "json"

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the "no-changelog" label to this PR.

Checklist

• Please read our Vector contributor resources.
• If this PR introduces changes Vector dependencies (modifies Cargo.lock), please
  run dd-rust-license-tool write to regenerate the license inventory and commit the changes (if any). More details here.

References

• Closes: prometheus_scrape source's query doesn't add the [] to mapping list #22049