Update all e2e tests to use Maze Runner v6

[twometresteve]

Goal

Update all Maze Runner setup to use v6.

Design

Largely follows the document process for upgrading MAze Runner from v4/v5.

Changeset

I found that the newer version of Maze Runner (or possible Cucumber that's wrapped in it) objected to multiple uses of the -e switch for Node. Rather than try to solve that, I updated the mechanism to use feature/scenarios tags of the form @skip_before_node_8. This approach is consistent with several of our other repos and I have checked that the same number of scenarios run for each version of Node before and after the change.

Testing

Covered by CI.

[github-actions]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	41.24 kB	12.71 kB
After	41.24 kB	12.71 kB
±	No change	No change

code coverage diff

Coverage values did not change👌.

Total:

Lines	Branches	Functions	Statements
0%(+0%)	0%(+0%)	0%(+0%)	0%(+0%)

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