chore: correct MATERIALIZED VIEW TYPE

[tianzhou]

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[Copilot]

Pull Request Overview

This PR corrects the display type for materialized views in PostgreSQL schema dump comments from "VIEW" to "MATERIALIZED VIEW" and updates the pgschema version references in test files.

• Updates the formatObjectCommentHeader function to properly detect and label materialized views
• Updates version references from pgschema 1.0.3 to 1.2.1 in test data files
• Fixes comment headers to correctly identify materialized views as "MATERIALIZED VIEW" type

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/dump/formatter.go	Adds special handling logic to correctly identify and label materialized views in comment headers
testdata/dump/sakila/pgschema.sql	Updates comment header to correctly label rental_by_category as MATERIALIZED VIEW type
testdata/dump/tenant/pgschema.sql	Updates pgschema version reference from 1.0.3 to 1.2.1
testdata/dump/employee/pgschema.sql	Updates pgschema version reference from 1.0.3 to 1.2.1
testdata/dump/bytebase/pgschema.sql	Updates pgschema version reference from 1.0.3 to 1.2.1

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