Use bqrs diff for all cases in the compare view when --result-sets is supported

[paldepind]

This PR makes "Compare Results" use the new --result-sets option that was added to the CodeQL CLI. When this option is supported we can use bqrs diff in all cases, and only need to fall back to the in-extension diff for old CLI versions (where "old" at the time of writing is all released CLI versions 😉).

I also made a small refactor to how we check for supported features. The new supportsFeature method automatically makes it possible to check for all the features in the CliFeatures type, without requiring us to manually add a method for all features to CliVersionConstraint. This made the CliVersionConstraint class superflous.

Closes #1364.

[Copilot]

Pull request overview

This PR enhances the "Compare Results" view to use the CodeQL CLI's bqrs diff --result-sets option for all comparison scenarios when supported by the CLI version. This improves performance and accuracy while maintaining backward compatibility with older CLI versions.

Key Changes:

• Introduced a generic supportsFeature() method to check CLI feature availability, eliminating the need for the CliVersionConstraint class
• Updated the compare view to use bqrs diff with the --result-sets option when available, falling back to the legacy in-extension diff only for older CLI versions
• Added bqrsDiffResultSets feature flag to track CLI support for the new option

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
extensions/ql-vscode/src/codeql-cli/cli-version.ts	Adds bqrsDiffResultSets feature flag to CliFeatures interface
extensions/ql-vscode/src/codeql-cli/cli.ts	Exports OLDEST_SUPPORTED_CLI_VERSION, adds generic supportsFeature() method, implements resultSets option for bqrsDiff, removes CliVersionConstraint class
extensions/ql-vscode/src/query-server/query-server-client.ts	Refactors to use new supportsFeature() method instead of cliConstraints
extensions/ql-vscode/src/extension.ts	Updates to use exported constant and simplifies version check logic
extensions/ql-vscode/src/compare/compare-view.ts	Implements conditional use of bqrs diff --result-sets based on CLI feature support
extensions/ql-vscode/src/compare/resultsDiff.ts	Adds deprecation notice indicating legacy status
extensions/ql-vscode/CHANGELOG.md	Documents the enhancement with PR references

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