chore(http): remove no-proxy dependency

[pront]

Summary

Motivation

The no-proxy crate served us well for a while. In the context of the HTTP v1 migration, we prefer owning this small contract in Vector to give the transport migration direct control over its proxy-routing behavior.

Changes

This implementation was LLM generated. It changes the underlying implementation and it preserves the usage behavior. Regression tests cover wildcard, host, dotted-host, host-and-port, IPv4, IPv6, CIDR, whitespace, deduplication, and serialization behavior.

References

• Related: #19179 — Upgrade the http crate to version 1.0.0.
• Related: #26157 — Migrate ClickHouse sink to Hyper 1.
• HTTP v1 migration plan.

Vector configuration

No configuration changes. Existing configurations such as the following retain the same shape and behavior:

proxy:
  enabled: true
  http: http://127.0.0.1:3128
  https: http://127.0.0.1:3128
  no_proxy:
    - localhost
    - 127.0.0.1
    - 192.168.0.0/16

How did you test this PR?

• make test (3,617 passed, 13 skipped)
• cargo test -p vector http::transport_tests --lib -- --test-threads=1 (26 passed)
• cargo test -p vector-core (251 passed; doctests: 1 passed, 1 ignored)
• cargo test -p vector-config (45 passed)
• make check-clippy
• make check-fmt
• make check-generated-docs with repository-pinned CUE 0.17.1 (248 examples passed, 4 skipped)
• make build-licenses
• make check-licenses
• cargo tree -i no-proxy confirms the package is absent from the dependency graph.

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. This is an internal dependency replacement with no intended configuration or runtime behavior change.

Contributor Guidelines

• Please read our Vector contributor resources.
• Do not hesitate to use @vectordotdev/vector to reach out to us regarding this PR.
• Some CI checks run only after we manually approve them. To catch issues early, add a pre-push hook (template) or run the following locally before pushing:
  • make fmt
  • make check-clippy (auto-fix with make clippy-fix)
  • make test
• After a review is requested, please avoid force pushes to help us review incrementally.
  • Feel free to push as many commits as you want. They will be squashed into one before merging.
  • For example, you can run git merge origin master and git push.
• If this PR introduces changes Vector dependencies (modifies Cargo.lock), please
  run make build-licenses to regenerate the license inventory and commit the changes (if any). More details on the dd-rust-license-tool.