Fix new clippy lints

[heaths]

We've had a number of toolchain updates - especially nightly - that have blocked PRs from merging due to stylistic clippy lints, as well as some other lints that are worth considering.

We should be more thoughtful about when and how we update long-term, but for now we can at least reduce the noise.

[heaths]

New nightly, new clippy lint. 😔

[Copilot]

Pull request overview

This PR addresses newly introduced Clippy lints by removing unnecessary borrows in formatting/debug-print call sites, keeping the code behavior the same while satisfying updated lint rules.

Changes:

• Remove redundant & borrows in format! arguments when building an Event Hubs partition source URL.
• Remove redundant & borrows in println!("{:?}", ...) debug output within azure_core error response tests.
• Remove redundant & borrow in an error formatting path in the test-proxy bootstrap extraction logic.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
sdk/eventhubs/azure_messaging_eventhubs/src/consumer/mod.rs	Avoids needless borrows when formatting the partition source URL (Clippy cleanup).
sdk/core/azure_core/src/error/error_response.rs	Avoids needless borrows in debug prints inside tests (Clippy cleanup).
sdk/core/azure_core_test/src/proxy/bootstrap.rs	Avoids needless borrows in error formatting during proxy archive extraction (Clippy cleanup).