IaC: fix problematic CFN plugin manager import

[k-a-il]

Motivation

The PR #13597 introduced changes which caused side-effects in another repository. This PR fixes problematic import by moving it to function level.

Changes

• Move import of CFN plugin manager to function level

Relates to FLC-80

[bentsku]

LGTM! Thanks for jumping on this!

We'll need to think more thoroughly about the upstream resources as well with this, and maybe deferring this import even further by making this a cached property instead of a static method we call once. But this can be a follow-up, let's unblock ourselves for now!

edit: there's also the issue of importing service code outside of the service itself, but we can think about that later. If we only have CloudFormation calling this code, then it would be fine. More argument towards deferring the import until CloudFormation itself calls this code/makes use of it 👍

[github-actions]

Test Results - Preflight, Unit

23 069 tests  ±0   21 224 ✅ ±0   6m 55s ⏱️ -38s
     1 suites ±0    1 845 💤 ±0 
     1 files   ±0        0 ❌ ±0 

Results for commit 10695c5. ± Comparison against base commit 7517af4.

[k-a-il]

LGTM! Thanks for jumping on this!

Thank you and @dfangl for identifying the issue!

We'll need to think more thoroughly about the upstream resources as well with this, and maybe deferring this import even further by making this a cached property instead of a static method we call once. But this can be a follow-up, let's unblock ourselves for now!

Good point, will follow-up on this 👍

[github-actions]

Test Results (amd64) - Acceptance

7 tests  ±0   5 ✅ ±0   2m 52s ⏱️ -4s
1 suites ±0   2 💤 ±0 
1 files   ±0   0 ❌ ±0 

Results for commit 10695c5. ± Comparison against base commit 7517af4.

[github-actions]

Test Results (amd64) - Integration, Bootstrap

    5 files      5 suites   2h 35m 36s ⏱️
5 590 tests 5 022 ✅ 568 💤 0 ❌
5 596 runs  5 022 ✅ 574 💤 0 ❌

Results for commit 10695c5.