Antalya 26.6 allow non matching schema export partition by name

[k-morozov]

Antalya 26.3 allow non matching schema export partition by name

Changelog category (leave one):

• New Feature

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Renamed the export_merge_tree_part_schema_mismatch_mode setting for EXPORT PART/EXPORT PARTITION to export_merge_tree_part_schema_match_mode, with values position (default, same behavior as before) and name, which matches destination columns to source columns by name instead of position. Added the export_merge_tree_part_ignore_extra_source_columns setting, which allows a source column without a matching destination column to be dropped instead of rejected with NUMBER_OF_COLUMNS_DOESNT_MATCH, in either matching mode

Documentation entry for user-facing changes

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[github-actions]

Workflow [PR], commit [8452168]