fix(credential-provider-ini): fix recursive assume role and optional role_arn in credential_source

[kuhe]

Issue

#6225

Description

This fixes chained assume role with ini role_arns and correctly enables optionality of the role_arn in the credential_source terminal profile section.

scenario 1: no role_arn in credential_source

[profile default]
source_profile=A
role_arn=1

[profile A]
source_profile=B
role_arn=2

[profile B]
credential_source=EcsContainer

The SDK will:

• enter default profile
• navigate to source profile A
• navigate to source profile B
• obtain source credentials from EcsContainer
• complete profile B
• complete profile A assume role with role_arn=2
• complete profile default assume role with role_arn=1

scenario 2: role_arn in credential_source

[profile default]
source_profile=A
role_arn=1

[profile A]
source_profile=B
role_arn=2

[profile B]
credential_source=EcsContainer
role_arn=3

The SDK will:

• enter default profile
• navigate to source profile A
• navigate to source profile B
• obtain source credentials from EcsContainer
• complete profile B assume role with role_arn=3
• complete profile A assume role with role_arn=2
• complete profile default assume role with role_arn=1

Testing

Added integration tests

[github-actions]

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