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Add a `--dry-run` flag to the `install` command ### What does this PR try to resolve? This PR add the `--dry-run` flag to the `cargo install` command (see #11123). I've tried to do the bare minimal for this flag to work without changing anything in the output. In my opinion, the `--dry-run` flag should mimic as close as possible the behavior of the normal command to avoid missing potential issue in the normal execution. ~~Currently we're missing information about where the binary will be installed.~~ Unlike #13598 this PR: - Include as much of the compilation process as possible without actually compiling - use the information provided by `BuildContext` instead of `InstallablePackage::new` - in the same way as `unit_graph`, it add a `dry_run` to the `CompileOptions` and return a `Compilation::new` from the function `compile_ws` without actually compiling. - keeps the output the same rather than adding status messages indicating which very broad actions would be performed - ~~remove some warning not relevant in the case of a `--dry-run`~~ Like #13598, the version check and crate downloads still occur. ### How should we test and review this PR? The first commit include a unit tests to ensure that no binary is actually installed after the dry run. There is also a snapshot test that show the diff output of the `--help` flag. ### Additional information Tests and documentation done in #13598, may be cherry picked into this PR if needed.