Integration test dependency cleanup (ansible-collections#1086)

Integration test dependency cleanup

SUMMARY

remove dependencies on setup_remote_tmp_dir where it's not used (often just copy & paste from another test)
remove setup_ec2 (no main.yml means it's not doing anything)
remove prepare_tests (empty main.yml means it's not doing anything)

ISSUE TYPE

Feature Pull Request

COMPONENT NAME
tests/integration/targets
ADDITIONAL INFORMATION
By cleaning up what we have we reduce the chance of people copying things about "because that's what test XYZ did".

Reviewed-by: Alina Buzachis <None>
Reviewed-by: Mark Woolley <[email protected]>

This commit was initially merged in https://github.com/ansible-collections/community.aws
See: ansible-collections/community.aws@dd12046

tests/integration/targets/aws_region_info/meta/main.yml

@@ -1,2 +1 @@
-dependencies:
-  - setup_remote_tmp_dir
+dependencies: []