[meta] Make config generation fully automated

[gregtatum]

In PR #620 I introduced automatic config generation, but the generated config generation still need some work until they are production ready. This issue tracks making them ready.

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1. In config generation, switch to two stage training when the mono data is too small firefox-translations-training#632
   enhancement +1
2. Figure out sacrebleu / dataset strategy firefox-translations-training#634
   enhancement +1
3. Add aug-mix to mtdata devtest datasets firefox-translations-training#651
   enhancement +1
4. Figure out accuracy of mtdata_Neulab-tedtalks datasets firefox-translations-training#635
   +0
5. Exclude mtdata datasets from config generation that return a 404 firefox-translations-training#642
   +0
   
6. Explore automatic document score threshold generation for HPLT #1003
   +0

[gregtatum]

Here is how I'm generating the configs right now:

task config-generator -- en ru --name spring-2024
task config-generator -- en id --name spring-2024
task config-generator -- en cs --name spring-2024
task config-generator -- en hu --name spring-2024
task config-generator -- en tr --name spring-2024
task config-generator -- en el --name spring-2024
task config-generator -- en fi --name spring-2024
task config-generator -- en vi --name spring-2024
task config-generator -- en sv --name spring-2024
task config-generator -- en sk --name spring-2024
task config-generator -- en ro --name spring-2024
task config-generator -- en da --name spring-2024
task config-generator -- en uk --name spring-2024
task config-generator -- en sl --name spring-2024
task config-generator -- en lt --name spring-2024
task config-generator -- en hr --name spring-2024
task config-generator -- en sr --name spring-2024
task config-generator -- en lv --name spring-2024
task config-generator -- en bs --name spring-2024
task config-generator -- id en --name spring-2024
task config-generator -- cs en --name spring-2024
task config-generator -- tr en --name spring-2024
task config-generator -- el en --name spring-2024
task config-generator -- vi en --name spring-2024
task config-generator -- sv en --name spring-2024
task config-generator -- sk en --name spring-2024
task config-generator -- ro en --name spring-2024
task config-generator -- da en --name spring-2024
task config-generator -- sl en --name spring-2024
task config-generator -- lt en --name spring-2024
task config-generator -- hr en --name spring-2024
task config-generator -- sr en --name spring-2024
task config-generator -- lv en --name spring-2024
task config-generator -- bs en --name spring-2024
task config-generator -- ru en --name spring-2024