Revert "Support retrieving workspace of path dependencies in cargo (#10550)"

[Jefffrey]

What are you trying to accomplish?

This reverts commit f238da5.

Closes #10584

#10550 caused a regression, reverting this for now as it was new functionality. Will need to revisit later after adding more test cases based on the repositories that encountered regressions due to this PR.

Anything you want to highlight for special attention from reviewers?

How will you know you've accomplished your goal?

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.

[Jefffrey]

An alternative could be to remove these error conditions entirely:

dependabot-core/cargo/lib/dependabot/cargo/file_fetcher.rb

Lines 260 to 262 in fc2312a

	msg = "Could not resolve workspace root for path dependency " \
	"#{workspace_member.path} of #{original_manifest.path}"
	raise Dependabot::DependencyFileNotEvaluatable, msg

dependabot-core/cargo/lib/dependabot/cargo/file_fetcher.rb

Lines 280 to 282 in fc2312a

	msg = "Could not resolve workspace root for path dependency " \
	"#{workspace_member.path} of #{original_manifest.path}"
	raise Dependabot::DependencyFileNotEvaluatable, msg

Which I think would keep this new functionality without affecting old behaviour

[abdulapopoola]

An alternative could be to remove these error conditions entirely:

dependabot-core/cargo/lib/dependabot/cargo/file_fetcher.rb

Lines 260 to 262 in fc2312a

	msg = "Could not resolve workspace root for path dependency " \
	"#{workspace_member.path} of #{original_manifest.path}"
	raise Dependabot::DependencyFileNotEvaluatable, msg

dependabot-core/cargo/lib/dependabot/cargo/file_fetcher.rb

Lines 280 to 282 in fc2312a

	msg = "Could not resolve workspace root for path dependency " \
	"#{workspace_member.path} of #{original_manifest.path}"
	raise Dependabot::DependencyFileNotEvaluatable, msg

Which I think would keep this new functionality without affecting old behaviour

Thanks @Jefffrey , please if you don't mind, can you raise this as a brand new PR?