fix: workaround for adding large scripts to CLI_DO_INIT_TASKS

Description

Reverts the non-functional fix for large init script size.

Adds a workaround to break up scripts in CLI_DO_INIT_TASKS that are too large to be passed to one invocation of sh.

Testing instructions

Steps to test the changes:

1. Add a large amount of data to the site_configuration of each GROVE_ADDITIONAL_DOMAINS, so that none individually exceed 128KiB, but do in total.
   • https://gitlab.com/opencraft/client/asu-moe/grove-development/-/commit/4087276018f2b6afa0a437536115f29d6ae293e3
2. See that deploy fails.
   • https://gitlab.com/opencraft/client/asu-moe/grove-development/-/jobs/6491940800
3. Use this branch of tutor-contrib-grove, deploy again.
   • https://gitlab.com/opencraft/client/asu-moe/grove-development/-/commit/8c03d29790b1d991dc6a623c2562467e81dfd081
   • N.b. actually using the branch https://gitlab.com/opencraft/dev/tutor-contrib-grove/-/tree/artur/lms-init-script-2-backport
4. See that deploy succeeds.
   • https://gitlab.com/opencraft/client/asu-moe/grove-development/-/jobs/6494400155

Checklist

If any of the items below is not applicable, do not remove them, but put a check in it.

• Git commit history is clean
• Git commits are following conventional-commit practices
• Unit tests are added/updated
• Documentation is added/updated

Additional context

Internal-ref: https://tasks.opencraft.com/browse/BB-8515