[OSSLifecycle OSSLifecycleRedirect] Add file_url param to pull from non-github sources

[JoeIzzard]

This PR addresses #10244 (OSS Lifecycle GitLab) by adding a queryParam of file_url. When this parameter is provided, we fetch the provided URL instead of defaulting to the GitHub RAW Content URL. Existing badges using the {user}/{repo} and {user}/{repo}/{branch} pattern are maintained, however providing file_url with these will still override the URL we fetch.

UI Changes:

• Added a OSS Lifecycle (file) OpenAPI entry for the new end point without path parameters
• Changed OSS Lifecycle to OSS Lifecycle (GitHub)
• Changed OSS Lifecycle (branch) to OSS Lifecycle (GitHub branch)

Changes to tests:

• Added new test to test using file_url against the Netflix OSS Tracker Repo

One potential improvement would be to rename the service class, currently it is OssTracker however everywhere else is referred to as osslifecycle.

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[chris48s]

I think the way I'd prefer to do this would be to make the badge route

/osslifecycle?file_url=

(i.e: completely get rid of :user, :repo and :branch params on the OssTracker class) and only implement fetching from an arbitrary URL on the OssTracker class.

Then we implement the legacy compatibility with redirectors that catch /osslifecycle/:user/:repo or /osslifecycle/:user/:repo/:branch+ and issue an appropriate redirect to /osslifecycle?file_url=https://raw.githubusercontent.com/whatever... That would be in line with how we usually do this. There are some similar examples you could look at:

• https://github.com/badges/shields/blob/master/services/maven-metadata/maven-metadata-redirect.service.js
• https://github.com/badges/shields/blob/master/services/jenkins/jenkins-build-redirect.service.js
• https://github.com/badges/shields/blob/master/services/sonar/sonar-redirector.service.js

Really the key thing is using the transformQueryParams method.

[JoeIzzard]

I didn't realise there was a redirector method, makes sense to do it that way.

I have stripped back the osstracker to just include fetching from any URL with file_url. All the existing checks are now using the file_url method so was able to remove the test I added in my first version. Added a redirector to handle the old methods, and added two tests to test with and without the branch parameter.

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[chris48s]

Thanks. Couple of minor changes then this is good to merge