Switch Lakehouse from v1beta to v1

[feefs]

Lakehouse's Iceberg REST Catalog went GA last November (https://cloud.google.com/blog/products/data-analytics/biglake-metastore-now-supports-iceberg-rest-catalog), so we should be using the v1 api instead of v1beta.

[gemini-code-assist]

Summary of Changes

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This pull request updates the integration tests to use the stable v1 API for the Iceberg REST Catalog. This change ensures that the test suite reflects the current production-ready state of the BigLake Metastore, replacing the deprecated v1beta endpoint.

Highlights

• API Version Update: Updated the Iceberg REST Catalog URI from v1beta to v1 across all integration tests to align with the GA release of the BigLake Metastore.

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[gemini-code-assist]

Code Review

This pull request updates the BigLake Iceberg REST catalog URI from the v1beta endpoint to the stable v1 endpoint across multiple integration test files. There are no review comments, so I have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.08%. Comparing base (3a2bdfd) to head (5c17fc2).
⚠️ Report is 4 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (3a2bdfd) and HEAD (5c17fc2). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (3a2bdfd)	HEAD (5c17fc2)
	4	1

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #4118       +/-   ##
=============================================
- Coverage     56.16%   38.08%   -18.08%     
+ Complexity     7336      511     -6825     
=============================================
  Files          1126      195      -931     
  Lines         68708    11764    -56944     
  Branches       7777     1179     -6598     
=============================================
- Hits          38587     4480    -34107     
+ Misses        27626     6919    -20707     
+ Partials       2495      365     -2130     

Components	Coverage Δ
spanner-templates	∅ <ø> (∅)
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	∅ <ø> (∅)
spanner-live-reverse-replication	∅ <ø> (∅)
spanner-bulk-migration	∅ <ø> (∅)
gcs-spanner-dv	∅ <ø> (∅)
see 956 files with indirect coverage changes

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