Updated CI workflows to avoid race conditions on PRs with concurrency label

[rashidnhm]

Context:
Currently there exists a race condition within the CI due to misconfiguration of the concurrency label.

This PR updates the affected workflows to fix the concurrency labels.

Description of the Change:
${{ github.event }} is not a string, but rather an object, when you have that in the concurrency label you get:

# Label
group: my-workflow-${{ github.event }}-${{ github.ref }}

# Renders as
group: my-workflow-[object Object]-refs/heads/my-branch

This was causing workflows that had pull_request and workflow_call triggers to overstep on each other's runtime as they both rendered with the same concurrency label.

This PR changes the attribute to use the correct string name event_name.

# Label
group: my-workflow-${{ github.event_name }}-${{ github.ref }}

# Renders as
group: my-workflow-pull_request-refs/heads/my-branch

Benefits:
Race conditions averted. No random job cancellations especially when PR needs wheels built.

Possible Drawbacks:
None.

Related GitHub Issues:
None. sc-66955

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit .github/CHANGELOG.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.48%. Comparing base (3d6db7a) to head (e94b402).
Report is 94 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #778   +/-   ##
=======================================
  Coverage   98.48%   98.48%           
=======================================
  Files         109      109           
  Lines       15801    15801           
=======================================
  Hits        15562    15562           
  Misses        239      239           

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[vincentmr]

LGTM, but do we want to target the RC branch?

[rashidnhm]

LGTM, but do we want to target the RC branch?

Probably best to have it in the default branch first. I'll open a subsequent PR to the rc branch

[maliasadi]

LGTM! Don't forget to update the changelog.

[rashidnhm]

@maliasadi @vincentmr

Re-requesting a review as I've had to address an additional issue within the PR.

Scipy was being installed to the python venv on the self-hosted runner, but the build was using the system Python (and thus could not find the installed scipy). This was causing sporradic failures and bugs.

The solution was to export Python_ROOT_DIR and Python3_ROOT_DIR to hint cmake's find_package to use the correct venv python installation for workflows running on aws instances.

[vincentmr]

LGTM, thanks again @rashidnhm .

[maliasadi]

Thanks @rashidnhm! Looks good to merge now :)