[ECP-9524] Refactoring related to E2E test workflow files

[candemiralp]

Description

This PR parameterise the test cases for E2E workflow for express checkout module and dispatch pipeline. Basically, all three workflow files have been merged into e2e-test.yml workflow file.

• If the workflow triggered from a release, it uses all test group and main branch` for express repository (express + standard)
• If the workflow triggered from dispatch event, it uses the input fields of the dispatcher
• If the workflow triggered from regular PR against main, it uses standard test group without express checkout tests

Tested scenarios

• Release tests
• Dispatch pipeline tests
• Regular PR tests

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud