Automatic garbage collection not running during long `LOAD DATA INFILE`

```
$ ls -alh .dolt/noms
total 294349328
drwxr-xr-x 8 timsehn staff 256B Feb 21 11:24 .
drwxr-xr-x 8 timsehn staff 256B Feb 21 13:06 ..
-rw-r--r-- 1 timsehn staff 1.5G Feb 21 13:09 journal.idx
-rw------- 1 timsehn staff 0B Feb 20 09:20 LOCK
-rw------- 1 timsehn staff 151B Feb 21 11:23 manifest
-rw------- 1 timsehn staff 41G Feb 21 11:23 o03nl0fkb3cagtb84vhlnua9rudnofdb.darc
drwxr-xr-x 5 timsehn staff 160B Feb 20 10:07 oldgen
-rw-r--r-- 1 timsehn staff 98G Feb 21 13:09 vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
$ dolt sql -q "show processlist"
+----+---------------------+-----------+---------------+---------+------+---------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+---------------------+-----------+---------------+---------+------+---------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 70 | root | localhost | doge_medicaid | Sleep | 5693 | | |
| 67 | root | localhost | doge_medicaid | Sleep | 5693 | | |
| 68 | root | localhost | doge_medicaid | Sleep | 5693 | | |
| 81 | root | localhost | doge_medicaid | Query | 8014 | | LOAD DATA LOCAL INFILE '/tmp/medicaid-provider-spending.csv' INTO TABLE medicaid_provider_spending FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n' IGNORE 1 LINES (BILLING_PROVIDER_NPI_NUM, SERVICING_PROVIDER_NPI_NUM, HCPCS_CODE, CLAIM_FROM_MONTH, TOTAL_UNIQUE_BENEFICIARIES, TOTAL_CLAIMS, TOTAL_PAID) |
| | | | | | | medicaid_provider_spending (0/? partitions) | |
| | | | | | | | |
| 96 | __dolt_local_user__ | localhost | doge_medicaid | Query | 0 | running | show processlist |
| 66 | root | localhost | doge_medicaid | Sleep | 5693 | | |
| 69 | root | localhost | doge_medicaid | Sleep | 5693 | | |
+----+---------------------+-----------+---------------+---------+------+---------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
```

I have a 98GB journal file.

Start by reproducing the long LOAD DATA LOCAL INFILE operation shown in the issue and monitor the .dolt/noms journal and process list while it runs. Investigate how garbage collection behaves during this operation; done means automatic garbage collection runs without leaving a journal file of the reported size.

Written by the indexing model from the issue text.