test: cover filters for mixed-format schema evolution

[liujiwen-up]

Purpose

Linked issue: #258

Add integration coverage for projection and filter combinations on mixed-format schema evolution tables.

Brief change log

• Add projected filter checks for mixed-format ADD COLUMN and INT -> BIGINT type promotion reads.
• Add small projected filter checks for mixed-format rename, drop, and reorder schema evolution reads.
• Reuse existing read test helpers and avoid production code changes.

Tests

• cargo fmt --check: passed
• git diff --check: passed
• cargo test -p paimon-integration-tests --test read_tables format_schema_evolution --no-run: passed
• cargo test -p paimon-integration-tests --test read_tables format_schema_evolution -- --nocapture: failed locally because prepared warehouse tables were missing

API and Format

No API or storage format changes.

Documentation

Not required; test-only change.

[QuakeWang]

LGTM