Tackle "plan not found" issues

[rui1610]

Purpose

This PR tackles issues that randomly popped-up during the execution of use cases. These issues where based on the fact that service plans might not be visible to the environment due to timing issues (plan took longer to be usable in environment)

Does the PR solve an issue

[ ] Yes - Please add issue number
[x] No

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

What to Check

Verify that the following are valid

• ...

Other Information

[lechnerc77]

Integration test successful see https://github.com/SAP-samples/btp-setup-automator/actions/runs/4325262075