OPENPYPE_REPOS_ROOT being set to launcher location, not openpype addon location

[sjt-rvx]

Ok, this could possibly be in both repos (launcer vs. openpype). But since this is only an issue when runnig via the launcher I'll put this here.

It seems that when running via the launcher, the variable $OPENPYPE_REPOS_ROOT is pointing to the launcher root and not the openpype addon root. I imagine the logic of setting $OPENPYPE_REPOS_ROOT needs to be moved over to the addon? Or maybe legacy_io is on it's way out?

For the stack trace this is where it's coming from:

  File "[addons_dir]/rvx_ayon_0.2.1/rvx_ayon/rvx_module.py", line 203, in show_variant_assembler
    variant_assembler = rvx_ayon.tools.variantassembler.app.create_variant_assembler()
  File "[addons_dir]/rvx_ayon_0.2.1/rvx_ayon/tools/variantassembler/app.py", line 588, in create_variant_assembler
    install_host(th)
  File "[addons_dir]/openpype_3.16.3-rvx.1/openpype/pipeline/context_tools.py", line 107, in install_host
    legacy_io.install()
  File "[addons_dir]/openpype_3.16.3-rvx.1/openpype/pipeline/legacy_io.py", line 35, in install
    schema.validate(session)
  File "[addons_dir]/openpype_3.16.3-rvx.1/openpype/pipeline/schema.py", line 71, in validate
    _precache()
  File "[addons_dir]/openpype_3.16.3-rvx.1/openpype/pipeline/schema.py", line 127, in _precache

[Jakub Trllo]

OPENPYPE_REPOS_ROOT should not be used in OpenPype anymore. We'll cleanup remaining usages over time.