It takes 10 seconds to open the "Select container app environment" option when editing target port through command palette

[Amar-QA]

OS: All
Build Version: 20240629.1
Regression: Not a Regression

Repro Steps:

1. Create more than 10 container app environments.
2. Open the command palette -> Select "Azure Container Apps: Edit Target Port...".
3. Check whether "Select a container app environment" option is opened within 3 seconds.

Expected:
The "Select a container app environment" option is opened within 3 seconds.

Actual:
It takes 10 seconds to open the "Select container app environment"
option.

More info:
This issue only reproduces through the command palette if there are too many container app environments.

[MicroFish91]

We should investigate if we can use a Promise.all here to improve performance... or migrate to using a list if it doesn't mess with the tree item displaying behavior.