chore: remove type: module, create openmct-e2e subpackage (#7590)

* fix: remove mystery webpack code

* fix: remove type:module and specify exports

- we aren't a module... yet

* fix: rename webpack*.js to webpack*.mjs so we can use import/export. fix imports

* fix: exports format

* fix: woops, need to add `start` script back

* chore: split e2e into its own module

* fix: use normal Painterro import

* fix: update e2e pathing

* fix: copy over helper functions

* chore: specify `cwd` for playwright configs so that openmct npm commands work as intended in any environment

* chore: add pretest script to e2e package.json

* chore: don't package e2e

* refactor: tidy up webpack common config

* chore: compile types to a single file

* chore: fix visual test npm scripts

* chore: fix import pathing

* chore: define package exports, move test specific dependencies to the subpackage

* chore: export test framework from openmct-e2e

* chore: export baseFixtures also

* chore: let `openmct` and `openmct-e2e` share `node_modules/`

* chore: use `--workspace`, remove pretest script

* Revert "fix: remove mystery webpack code"

This reverts commit eb14d52569ffa27ab1a090b883694f4707b59cd0.

* chore: update package-lock

* chore: add `.npmignore`

* fix: *js -> mjs

e2e/tests/visual-a11y/defaultPlugins.visual.spec.js

@@ -23,7 +23,7 @@
 /*
 Collection of Visual Tests set to run in a default context with default Plugins. The tests within this suite
 are only meant to run against openmct's app.js started by `npm run start` within the
-`./e2e/playwright-visual.config.js` file.
+`playwright-visual.config.js` file.
 */
 
 import percySnapshot from '@percy/playwright';