Add new fields to MICROBE checklists

Edit checklist in checklist editor
We also need to collect some additional metadata for the next round of samples

thawing conditions (24 hours waiting after thawing before sequencing)
thawing temperature metadata (water bath)
media used
freezing metadata (liquid nitrogen vs vapor phase)
Cooling rate metadata (Mr. Frosty vs. Stirling Cycle)

Start in the checklist editor and trace how MICROBE checklist fields are defined and saved. Confirm how existing sample metadata fields are represented, then add the requested thawing, media, freezing, and cooling-rate fields with their stated options or context. Done means all listed metadata can be entered and retained in a checklist.

Written by the indexing model from the issue text.