chore: change load_file_metadata_expire_hours default from 24*7 to 12 hours

[BohuTANG]

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Summary

• load_file_metadata_expire_hours now is 12 hours

• For optimal COPY operations, it is recommended to use the following syntax: COPY INTO <table> FROM FILES = ('file1', 'file2'), no need s3 list. https://docs.databend.com/sql/sql-commands/dml/dml-copy-into-table#files

• Fixes #15500

Tests

• [ ] Unit Test
• [ ] Logic Test
• [ ] Benchmark Test
• [x] No Test - default setting value change

Type of change

• [ ] Bug Fix (non-breaking change which fixes an issue)
• [ ] New Feature (non-breaking change which adds functionality)
• [ ] Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• [ ] Documentation Update
• [x] Refactoring
• [ ] Performance Improvement
• [ ] Other (please describe):

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This change is 

[what-the-diff[bot]]

PR Summary

• Updated Settings Value for File Metadata Expiry The duration after which file metadata gets refreshed was previously set to a week (168 hours). This PR changes the expiration time to just 24 hours, meaning that file information will be updated more frequently.

[sundy-li]

docs need to be updated

COPY INTO ensures idempotence by automatically tracking and preventing the reloading of files for a default period of 7 days. This can be customized using the load_file_metadata_expire_hours setting to control the expiration time for file metadata.
This parameter defaults to False meaning COPY INTO will skip duplicate files when copying data. If True, duplicate files will not be skipped.

[BohuTANG]

docs need to be updated

COPY INTO ensures idempotence by automatically tracking and preventing the reloading of files for a default period of 7 days. This can be customized using the load_file_metadata_expire_hours setting to control the expiration time for file metadata.
This parameter defaults to False meaning COPY INTO will skip duplicate files when copying data. If True, duplicate files will not be skipped.

~Will update after this PR merged.~ PR: https://github.com/datafuselabs/databend-docs/pull/788

[TCeason]

("load_file_metadata_expire_hours", DefaultSettingValue {
                    value: UserSettingValue::UInt64(24),
                    desc: "Sets the hours that the metadata of files you load data from with COPY INTO will expire in.",
                    mode: SettingMode::Both,
                    range: Some(SettingRange::Numeric(0..=u64::MAX)),
                }),

The value means hours. So the range's max use u64::MAX that may not be very reasonable