fix: support multi-type columns in flat run table

[keita-determined]

Ticket

ET-792

Description

• Support multi-type columns in flat run table in case there are the same column names with different types.

Test Plan

• Add columns from column picker, and columns show the right data even if there are the same column name like metadata.
• Column header shows its types.
  • some special columns does not show types since types are unknown

Checklist

• [x] Changes have been manually QA'd
• [ ] New features have been approved by the corresponding PM
• [ ] User-facing API changes have the "User-facing API Change" label
• [ ] Release notes have been added as a separate file under docs/release-notes/ See Release Note for details.
• [ ] Licenses have been included for new code which was copied and/or modified from any external code