Combine E2E tests with production code

Background

See the ADR here:
https://github.com/Alfresco/SearchServices/blob/156eaad1c04e61a0517ff1da7aea62e41ad4ce59/alfresco-search/doc/architecture/decisions/0005-merge-tests-and-production-code.md

This was created from these spikes: SEARCH-1401 and SEARCH-1513.

Acceptance Criteria

The E2E project should be archived
As a team member
When I look at the E2E project
Then I can see the old code and PRs
And I cannot push new changes.

Each branch of the production code project should contain the relevant E2E tests
As a team member
When I look at a branch of the combined project
Then I can see only the E2E tests that should pass against that branch.

History should be preserved
As a team member
When I look at the git history of a branch of the combined project
Then I can see the history of the relevant production and E2E code.

As a community member
When I look at the git history of a branch of the community project
Then I can see the history of the community production and E2E code.

Bamboo should be running the tests
As a team member
When I look at a branch on the CI system
Then I can see the results for each of the E2E tests that should be run against that branch.