Add additional property for pipeline response

[akchinSTC]

Adds an additional git_url property to the submission dialog box
to provide users a link to the location of the DAG in the GitHub
repository

Fixes #1362

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[akchinSTC]

[lresende]

Clicking the GitHub link:

Note the double slash on the URL, even after #1363, also, because we use the token to access the repo, there is no guarantee that the user submitting the pipeline will have access to the shared git repository used to store the DAGs.

Anyway, just my $0.02 :)

[akchinSTC]

@lresende - not able to access the repo cause you guys dont have permissions via UI I think.
Ill strip out the extra slash in the url context

[ajbozarth]

some frontend review

[ajbozarth]

The front end code look good, note that I haven't reviewed the backend code or tested this locally though

[kevin-bates]

Looking good, just had some suggestions and a question about what your findings were with kwargs.

[akchinSTC]

@kevin-bates, thanks kevin, yeah didnt need the kwargs or super call. cleaned it up a bit.

[kevin-bates]

Thanks Alan. Full disclosure: I didn't test this other than by inspection.

[ptitzler]

Not introduced by this PR but also not resolved yet is the path issue:
The following runtime config settings

https://api.github.com
akchinstc/test-repo
main

yield the following URL:

https://github.com//akchinstc/test-repo/tree/main

[ptitzler]

Working as expected for KFP and AA, aside from the URL issue I mentioned.

[akchinSTC]

@ptitzler - added a fix for the extra slash in the generated URL

[ptitzler]

Can you please add automated tests for get_github_url? I am sure we'll hit issues in the future once we see more URLs in the wild that'll break the current logic. This way we can just keep adding more tests when that happens.