impl(bigquery): validate table format for writes

[dbolduc]

While the binding code may look unreasonably complicated, it produced this error for the existing (incorrect) unit test:

Error: cannot find a matching binding to send the request: field `table` should match the template: 'projects/*/datasets/*/tables/*'; found: 'projects/p/tables/t'

Fixes #6249

[gemini-code-assist]

Code Review

This pull request introduces table format validation to the WriterBuilder::default method using gaxi path matching, and adds parameterized unit tests using the test-case crate to verify both valid and invalid table formats. The feedback suggests extracting the duplicated Segment array in the validate_table function into a local slice variable to improve readability and prevent future maintenance issues.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.07%. Comparing base (0dac6ea) to head (eba8ad0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6253   +/-   ##
=======================================
  Coverage   96.07%   96.07%           
=======================================
  Files         275      275           
  Lines       68829    68861   +32     
=======================================
+ Hits        66126    66161   +35     
+ Misses       2703     2700    -3     

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