Adding the Mattermost Plugins E2E Utils as a dependency

[panoramix360]

This PR is intended to test the integration with the Mattermost Plugins E2E Utils that I'm working on with @mickmister!

I'm creating as a draft for now, so we can test it.

Related PR in mattermost-plugin-e2e-test-utils repo
mattermost-community/mattermost-plugin-e2e-test-utils#3

Related thread
https://community.mattermost.com/core/pl/w4oistz7rtn4bj9ewfu8neimdh

[mickmister]

Great work @panoramix360!! This is awesome that we're now connecting the dots between this repo and mattermost-community/mattermost-plugin-e2e-test-utils#3. This is going to be so awesome using this here! 🚀

Next steps here are to adapt the code in e2e/playwright folder that is related to the obsolete configuration:

• support/init_test.ts should set up stuff for the mattermost-plugin-e2e-test-utils package usage
• Things from support should be transferred to the shared package for reuse by other plugins
• setup-environment can be removed
• Any functionality imported from @e2e-support/* should be relocated to the shared package. This includes the test function which is a modification of playwright's test function, supported by playwright's test.extend function. It may be easiest to explain this plan on a video call https://github.com/mattermost/mattermost/blob/659377395915ae19c3548930cd450102280b9f9f/e2e-tests/playwright/support/test_fixture.ts#L25

Please let me know of any questions you may have, and if you feel a video call would be most efficient to discuss this. Thanks so much @panoramix360! Great job!!

[mickmister]

From my comment above:

Any functionality imported from @e2e-support/* should be relocated to the shared package.

I'm thinking a lot of this stuff is already in the shared package. If there's anything else that this @e2e-support import is providing, we can move it over to the shared package.