pyodide_testrunner: display console on error

[perrinjerome]

Description (e.g. "Related to ...", etc.)

If something is wrong with the test running on CI and selenium get a timeout, the test output was not displayed.

Code review checklist (for code reviewer to complete)

• [x] Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• [x] Title summarizes what is changing
• [x] Commit messages are meaningful (see this for details)
• [x] Tests have been included and/or updated, as appropriate
• [/] Docstrings have been included and/or updated, as appropriate
• [/] Standalone docs have been updated accordingly
• [/] CONTRIBUTORS.md was updated, as appropriate
• [/] Changelog has been updated, as needed (see CHANGELOG.md)

[perrinjerome]

Example test failure without any output because of a timeout (before this change): https://github.com/perrinjerome/pygls/runs/7270783998?check_suite_focus=true

Example test failure with the test output (after this change): https://github.com/perrinjerome/pygls/runs/7271213761?check_suite_focus=true#step:5:357

( this test failure was a run with some unfinished changes, the test does not fail like this on master branch )

[perrinjerome]

Thanks ! When I was running this, 120 seconds was enough to run the full test and a bit long when waiting for test to timeout in case of that error I had. I guess this is a good value for now.