chore: merge test case

[tianzhou]

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[Copilot]

Pull Request Overview

This PR consolidates test cases for SQL view creation and formatting by merging multiple test scenarios into a single comprehensive test suite. The changes eliminate redundant test cases while preserving coverage for array operators, text search functions, and view formatting.

• Removed duplicate test cases for add_view_coalesce and add_view_array_operators
• Merged test coverage into the main add_view test case
• Updated SQL formatting logic to consistently use custom formatter and handle indentation
• Fixed whitespace normalization in tests to preserve indentation

Reviewed Changes

Copilot reviewed 21 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
testdata/diff/create_view/add_view_coalesce/*	Removed entire test case directory (all files deleted)
testdata/diff/create_view/add_view_array_operators/*	Removed entire test case directory (all files deleted)
testdata/diff/create_view/add_view/old.sql	Merged table schema with additional columns to support consolidated tests
testdata/diff/create_view/add_view/new.sql	Merged view definitions for array operators and text search into single test
testdata/diff/create_view/add_view/diff.sql	Updated expected diff output with merged view definitions
testdata/diff/create_view/alter_view/diff.sql	Fixed formatting to place SELECT on same line as view name
testdata/diff/create_materialized_view/*/diff.sql	Simplified WHERE clause formatting (removed explicit type casts)
ir/normalize.go	Removed conditional logic for custom formatter, now always uses it
ir/formatter.go	Fixed SELECT formatting to place first column on same line; added DISTINCT support
internal/diff/diff_test.go	Fixed SQL normalization to preserve indentation while trimming trailing whitespace

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