Fix parsing of dataflow api endpoint URLs to remove trailing slash

[jrmccluskey]

Trailing slashes were breaking some, but not all, internal tests. This PR sanitizes the URLs properly to avoid this problem.

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Summary of Changes

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This pull request addresses issues where trailing slashes and whitespace in Dataflow API endpoint configurations caused intermittent test failures. By sanitizing these inputs, the client ensures reliable connectivity to the intended service endpoints.

Highlights

• URL Sanitization: Added stripping of whitespace and removal of trailing slashes from the Dataflow API endpoint URL to ensure consistent and valid connection strings.
• Regression Testing: Introduced a new test case in apiclient_test.py to verify that various malformed endpoint inputs are correctly sanitized.

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Code Review

This pull request cleans up the dataflow_endpoint in the Dataflow API client by stripping whitespace and trailing slashes, and adds corresponding unit tests. The feedback suggests checking if the endpoint is empty after stripping to avoid passing an empty string to ClientOptions, and improving the test assertions by verifying the mock was called and using call_args.kwargs for better readability.

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R: @damccorm for label python.

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[jrmccluskey]

R: @shunping @Abacn

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