Add ICU4X 2.2 support to conformance test dashboard

[sffc]

Adds support for ICU4X 2.2 to the conformance test dashboard.

Changes

• Executor: Created executors/rust/2.2/ with ICU4X 2.2.0 dependencies.
• Compatibility: Updated shared Rust executor code to handle ICU4X 2.2 API changes (stabilization of CompactDecimalFormatter, relocation of LocaleDisplayNamesFormatter, and #[non_exhaustive] constraint on RelativeTimeFormatterOptions) using backward-compatible version gating.
• Toolchain: Upgraded Rust toolchain to 1.87 across scripts and CI to support Edition 2024 required by ICU4X 2.2 dependencies.
• Configuration: Registered rust2.2 in run_config.json and testdriver/datasets.py.
• Conflict Resolution: Removed older conflicting Rust versions (rust2.1 and rust2.0-beta2) from run_config.json to resolve the output overwrite conflict (tracked in [Harness Bug] Output overwrite conflict when running multiple versions of the same executor on the same ICU version #553).

🤖 This pull request was created by an AI agent working with @sffc.

Changelog

• Added ICU4X 2.2 executor.
• Updated Rust toolchain to 1.87.
• Removed conflicting older Rust versions from run configuration.

[gemini-code-assist]

Code Review

This pull request introduces support for Rust executor versions 2.1 and 2.2, updates the Rust toolchain version to 1.87 across setup and execution scripts, and adapts the Rust executor source files to handle the new version configurations. Feedback on the changes highlights a potential build conflict where different Rust executor versions overwrite each other's binaries due to a shared target directory in run_config.json and testdriver/datasets.py. Additionally, a performance improvement is suggested in relativedatetime_fmt.rs to avoid unnecessary string allocations by using as_deref().

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[Copilot]

Pull request overview

Adds ICU4X 2.2 support to the conformance dashboard by introducing a new Rust executor and updating shared Rust executor compatibility shims/tooling configuration to accommodate ICU4X 2.2 API changes.

Changes:

• Added a new Rust executor package under executors/rust/2.2/ targeting ICU4X 2.2.0.
• Updated Rust executor source to handle ICU4X API movements/changes via version-gated imports and call sites.
• Updated scripts/CI and configuration to recognize the new version (and avoid conflicting older Rust runs in run_config.json).

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
testdriver/datasets.py	Registers ICU4X/Rust 2.1 and 2.2 in dataset/executor version maps.
setup_macos.sh	Updates expected Rust toolchain version to 1.87 for macOS setup.
setup_linux.sh	Updates expected Rust toolchain version to 1.87 for Linux setup.
run_config.json	Removes conflicting older Rust entries and adds rust2.2 run configuration.
generateDataAndRun.sh	Bumps RUSTUP_TOOLCHAIN to 1.87.
genData100.sh	Bumps RUSTUP_TOOLCHAIN to 1.87.
executors/rust/src/relativedatetime_fmt.rs	Updates options construction to accommodate #[non_exhaustive] options in newer ICU4X.
executors/rust/src/numberfmt.rs	Version-gates CompactDecimalFormatter import and formatting APIs for ICU4X 2.2.
executors/rust/src/localenames.rs	Adjusts display-names imports for newer ICU4X module layout.
executors/rust/src/displaynames.rs	Adjusts display-names imports for newer ICU4X module layout.
executors/rust/common/print_icu4x_version.rs	Extends cfg(ver=...) list to include 2.1 and 2.2.
executors/rust/2.2/src/main.rs	Adds the 2.2 executor entrypoint wiring to shared runner.
executors/rust/2.2/Cargo.toml	Defines ICU4X 2.2 executor crate dependencies/features.
executors/rust/2.2/Cargo.lock	Locks dependencies for the ICU4X 2.2 executor crate.
executors/rust/2.2/build.rs	Wires build-time version/env emission for the 2.2 executor.
.github/workflows/run-rust.yml	Extends Rust lint matrix to include 2.1/2.2 and bumps toolchain to 1.87.
.github/workflows/e2e.yml	Bumps Rust toolchain to 1.87 for e2e runs.

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