Improve test coverage through integration tests

[trieloff]

This has been a bit more painful than I expected. The integration test now loads helix-rum-enhancer through a (slightly prepared) version of helix-rum-js and then validates the checkpoints that have been sent using a mocked navigator.sendBeacon. This helps to bring up the coverage of index.js, but there are still good chunks of it that require more fiddling, especially when we look at URL parameter comprehension

• test(index): click somewhere
• test(integration): perform integration tests with slightly patched rum-js
• test(webkit): make integration test pass in webkit
• test(integration): make sure correct code coverage for integration test gets generated
• test(integration): remove unused plugins
• test(integration): fake more sendBeacons
• test(integration): test more checkpoints

[adobe-bot]

This PR will trigger no release when merged.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.58%. Comparing base (bb71ae6) to head (baaf738). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #226 +/- ## =========================================== + Coverage 73.83% 84.58% +10.75% =========================================== Files 5 5 Lines 493 493 =========================================== + Hits 364 417 +53 + Misses 129 76 -53 ```

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[adobe-bot]

:tada: This issue has been resolved in version 2.17.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: