`reset --hard` silently drops untracked tables with column tag collisions

Untracked tables should be preserved across `dolt reset --hard`. When an untracked table's column tags collide with a column in the target commit, the table is silently dropped. `dolt rebase` is affected through the same code path.
```bash
dolt init

dolt checkout -b feat
dolt sql -q "CREATE TABLE bar (code varchar(64) PRIMARY KEY);"
dolt add . && dolt commit -m "add bar"

dolt checkout main
dolt sql -q "CREATE TABLE users (name varchar(64) PRIMARY KEY);"
dolt sql -q "INSERT INTO users VALUES ('alice');"

dolt reset --hard feat
dolt sql -q "SELECT * FROM users"
```

**Expected:** `alice`
**Got:** `table not found: users`