refactor `dump_failures` script to have an excluded manifest list instead of harcoded in the middle of the logic

[jmaher]

in dump_failures.py, there is some code like this:

            if manifest in ("dom/canvas/test/mochitest.ini",):
                continue

the reason for this is the format of test names and output is not supported yet (due to being a sub test suite) in dump_failures, so until we have logic to handle these sub test suites it is simpler to skip these as seen in the current code.

To solve this issue here are some recommendations:

1. build a list of manifests that are defined at the top of the file in a constant (SKIPPED_MANIFESTS = ...)
2. replace the current code to use the new list of defined tests
3. add a comment in code to help out with this, update any documentation as needed

[jmaher]

as a note, this skip would skip both the summarization and any editing commands that are issued. Currently this is just skipping the DUMP_FAILURES_EDIT_COMMAND.

[deepto98]

@jmaher Hi, I'd like to take this up, can you please assign this to me?

[jmaher]

Hi @deepto98, thanks for finding our project and your interest in helping out here. We are preparing for the upcoming Outreachy internship cycle and these issues were created to get applicants up to speed on our project and help us evaluate and choose the intern. I would like to keep this issue and related issues on hold for applicants.

I would like to help you find something just as interesting and rewarding for you to work on to meet your goals. Maybe send me an email "jmaher @ mozilla.com" so I can learn more of what your goals are and can help you find the right project/tech stack.

[deepto98]

Sure, I'll get in touch and see if I can contribute somewhere else 😀

[carcablop]

Hi there. I will work on this bug. Thanks.

[Rohitrout416]

hey @jmaher, there is this error.

Can you please tell how to solve it?