swap source dist install + check and wheel install + check in build packages step in main.yml

[MichelleArk]

resolves #N/A

Problem

• dbt-core has overlaps in its build dependencies and functional ones (e.g. packages)
• setuptools 71+ no longer vends its dependencies and will rely on dependencies installed in the system
  • related issue: [BUG] TypeError: canonicalize_version() got an unexpected keyword argument 'strip_trailing_zero' pypa/setuptools#4483
• this means the wheel install could change the python dependencies before source distribution install and validation

Solution

• we'll fix this by swapping the order in 1.3 and below (since the packages conflict only arose there), but a better long term fix would be to build and check wheels and source dists in separate venvs to avoid package conflicts: Build and check source distributions and wheels independently in build packages #10465

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
• This PR includes type annotations for new and modified functions

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[github-actions]

The backport to 1.2.latest failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-1.2.latest 1.2.latest
# Navigate to the new working tree
cd .worktrees/backport-1.2.latest
# Create a new branch
git switch --create backport-10463-to-1.2.latest
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 0395264c57280a931715b04b314745dc75f2e4d2
# Push it to GitHub
git push --set-upstream origin backport-10463-to-1.2.latest
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.2.latest

Then, create a pull request where the base branch is 1.2.latest and the compare/head branch is backport-10463-to-1.2.latest.