MONGOID-5904 Use new toolchain 9.0-stable

[comandeo-mongo]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the MongoDB Ruby driver project to use a new toolchain for building and testing. The changes standardize configuration formats, replace Docker-based testing with direct Ruby version management via rbenv, and update CI/CD infrastructure.

Key changes:

• Migration from Docker-based testing to rbenv-managed Ruby installations
• Standardization of topology naming conventions (e.g., standalone → server, replica-set → replica_set)
• Implementation of JUnit test result reporting with the rspec_junit_formatter gem

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
gemfiles/standard.rb	Adds rspec_junit_formatter gem dependency for test result reporting
.evergreen/run-tests.sh	Replaces environment setup functions with rbenv installation, removes server orchestration code
.evergreen/run-tests-atlas-full.sh	Replaces environment setup with rbenv installation, adds JUnit formatter to test execution
.evergreen/config/variants.yml.erb	Standardizes topology naming, updates OS identifiers, comments out Rails master variant
.evergreen/config/commands.yml.erb	Renames install dependencies to setup system, adds bootstrap-mongo-orchestration function
.evergreen/config/axes.yml.erb	Standardizes topology and variable naming, removes redundant OS configurations
.evergreen/config.yml	Generated config file reflecting all changes from the template files

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