implement method to obtain logs download link from workflow run

[jonapich]

This implements 2 new endpoints:

• Get download link for workflow run (latest attempt)
• Get download link for workflow run (WorkflowRun instance's attempt)

I also supplied a quick example of how to consume this download link, but I'm open to include this as a separate "courtesy" function (e.g.: def get_logs_for_this_attempt() -> Dict[PurePath, str]: ...).

I wasn't able to record the tests because I need admin access to the repository. Can an admin do that for me? 🥺

[EnricoMi]

Looks like there is precedence for following the Location link to download file content:

PyGithub/github/Repository.py

Lines 2147 to 2149 in 0b8435f

	# Handle 302 redirect response
	if headers.get("status") == "302 Found" and headers.get("location"):
	headers, data = self._requester.requestJsonAndCheck("GET", headers["location"], parameters=url_parameters)

[jonapich]

Looks like there is precedence for following the Location link to download file content:

PyGithub/github/Repository.py

Lines 2147 to 2149 in 0b8435f

	# Handle 302 redirect response
	if headers.get("status") == "302 Found" and headers.get("location"):
	headers, data = self._requester.requestJsonAndCheck("GET", headers["location"], parameters=url_parameters)

Doing it this way will prevent users from using a streaming response. Large files need a separate download method.