[AWS] Fix config syntax for IAM profile

[Michaelvll]

Fix the syntax for the AWS IAM profile introduced in #3488, so that the wildcard matching will follow the order the user specified.

from

aws:
  remote_identity:
    my-cluster1-*: my-service-account1
    my-cluster2-*: my-service-account2

to

aws:
  remote_identity:
    - my-cluster1-*: my-service-account1
    - my-cluster2-*: my-service-account2

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)
  • sky jobs launch -n test echo hi --cloud aws

jobs:
  controller:
    resources:
      cloud: aws

aws:
  remote_identity:
    - sky-jobs-controller-*: SERVICE_ACCOUNT
    - "*": ray-autoscaler-v1

• All smoke tests: pytest tests/test_smoke.py
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_fill_in_the_name
• Backward compatibility tests: conda deactivate; bash -i tests/backward_compatibility_tests.sh

[cblmemo]

Thanks! LGTM. It should be ready to go after the format test passed.