Fix: set ENV VARS as invocation context for dbt >= 1.8

[illia-yurtsiv-proxet]

Rationale:

dbt_core v1.8.0 introduces dependency on dbt_common package which wasn't the thing prior to 1.8.x. In dbt_common, they introduce InvocationContext class. It's used in cli's preflight decorator that sets the context before any actual CLI operation:

• set_invocation_context
• get_invocation_context

Then it's used in dbt_core's SecretContext which is necessary if you use something like:

Changes:

This PR tries to import set_invocation_context and get_env from dbt_common and then set ENV VARs before actual profile rendering in Jinja.

[illia-yurtsiv-proxet]

@z3z1ma please, pay attention, that this PR is required to support DBT 1.8