* Add psr-4 for the internal classes -- this is a temp. changes. We should remove it once we completely merge to the core
* Register class aliases
* Move WcPayPromotion classes to the internal
* Ignore namespace PHP CS issue
* Make features/WcPayPromotion internal
* Added src-internal directory for Automattic\WooCommerce\Internal\Admin namespace
* Moved src/Features/WcPayPromotion to src-internal/Admin/WcPayPromotion
* Add phpcs rules for src-internal
* Remove phpcs:ignoreFile
* Update letter case to make it PSR4 compatible
* Fix letter cases
* Move the alias array into the function
* Rename WcPayPromotion to WCPayPromotion (letter case update)
* Include src-internal
* Update letter case
* Make classes internal
* Update references
* Fix WC_ADMIN_ABSPATH path
* Add notes helper method for date ranges
* Update two of the notes with date ranges
* Add tests and fix range logic
* Add changelog
* Update comments
* Update range name and added exception if invalid range passed in.
* Fix php unit tests
* Fix another test
* Add survey class and URL builder method
* Use survey URL method in notes
* Pass survey URL to opt out modal
* Simplify source/query filter
* Move survey URL to constant
* Update dependencies in prep for Composer 2.x.
* Rollback jetpack autoloader update.
* Restore range versions for composer dependencies, regenerate lock with Composer 1.x.
* Fix PSR-4 Classes (https://github.com/woocommerce/woocommerce-admin/pull/5473)
* PSR-4 class names need to match their filename.
Remove underscores in classnames.
* Fix reported class name in deprecation notice.
* Fix comments.
* We don't need composer dependencies in core WC test setup.
* Update composer lockfile using version 2.x.
* Temporarily turn off error display.
Function deprecation notices are breaking tests.
* Rename admin notes classes and file names to fit conventions
* Use a facade class that adds deprecation warnings to each function call
* Tidy up after rebase
Co-authored-by: Rebecca Scott <me@becdetat.com>