fix: show 'NULL' instead of nothing in status col

[murilx]

After further research, apparently the problem only existed in the boots table in hardware details. The can be seem in this page Tests table showing 'NULL' status correctly, this page Boots table showing 'NULL' status correctly in the build table code in src/components/BuildsTable/DefaultBuildsColumn.tsx (since I couldn't find a tree or hardware that had Build with null status)

    cell: ({ row }): string => {
      return row.getValue('status')
        ? row.getValue('status')!.toString().toUpperCase()
        : 'NULL';
    },

Here an example of the bug happening in the boots table for hardware details

• Boots table in staging showing nothing
• Boots table in localhost showing NULL

This happens because in the TreeDetailsView there's already a process ensuring that record["test_status"] = "NULL" if status is null/None in the database, and HardwareDetailsView does not have the same processing being done.

Closes #714

Visual reference

Before

After

[WilsonNet]

put it on a constant

[WilsonNet]

ditto about constant

[WilsonNet]

worked on my tests, just a minor comment

[Francisco2002]

Nice job!!