Presets V6 support (package and workflow) (microsoft#3548)

* Draft incomplete - does not compile

* Remaining functionality, needs more cleanup and testing

* More bug fixes, not much cleanup

* More bug fixes and stabilization

* fix indentation issues, unused variables, etc.

* Implement first round of code review feedback

* Fix more subtle and complex merge conflicts

* Fix linter issues

* Forgot to dispose of package event subscription

* PR review round two

* Incomplete status bar support for V6 presets. Don't clear output when in workflow mode, regardless of cleanOutputBeforeBuild setting. More cleanup.

* Finish status bar UI support for package and workflow presets

* Add validation of presets structure (applies to all). Fix some bugs.

* Skip expanding strings when not necessary. Remember more presets associations in the workspace state when reseting configure preset. More cleanup.

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Co-authored-by: Garrett Campbell <gcampbell@microsoft.com>

CHANGELOG.md

@@ -46,6 +46,7 @@ Bug Fixes:
 Features:
 - Support different debug config for different targets. [PR #2801](https://github.com/microsoft/vscode-cmake-tools/pull/2801) [@RichardLuo0](https://github.com/RichardLuo0)
 - Add ability to get a test's `WORKING_DIRECTORY` in launch.json via `cmake.testWorkingDirectory` [PR #3336](https://github.com/microsoft/vscode-cmake-tools/pull/3336)
+- Add support for CMake Presets V6 (package presets to run CPack and workflow presets). [#2871](https://github.com/microsoft/vscode-cmake-tools/issues/2871)
 
 Improvements:
 - Updated debugging documentation to add the LLDB configuration needed for macOS. [PR #3332](https://github.com/microsoft/vscode-cmake-tools/pull/3332) [@slhck](https://github.com/slhck)