Isolating distribution testing

[leahwicz]

resolves dbt-labs/dbt-adapters#632

Problem

We validate wheel and source distributions in the same environment during the build validation step. This led to issues documented here dbt-labs/dbt-core#10465.

Solution

This is the same solution as what we did in dbt-snowflake first: dbt-labs/dbt-snowflake#1161
This is to bring parity to the other repos as well.

This is a test run of the Action running with the installation and testing of wheels and source distributions split into separate Actions Jobs that isolate them from one another: https://github.com/leahwicz/dbt-redshift/actions/runs/10821351505

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

[leahwicz]

This repo is behind on some of the versions of Actions that are updated in the other repos. I figured I would update them while changing this file to match what we have everywhere else. The run still passes without issues on the upgrade

[leahwicz]

Same here, I remember wanting to keep on the latest images (this isn't the case for Mac, not sure why). So the other adapter repos use latest instead of a hard coded version so updating this to keep parity as well. I can revert this if it isn't wanted

[mikealfare]

We determined that it's better to hard pin and then upgrade as we can. The primary issue is that the latest tag eventually bumps and the new image may not have all of the python versions installed. We ran into this on macos in particular, which is probably what we used to pin that in the past.

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