fix: Change condition blocks to allow multiple blocks in the same way as action blocks

[trevorrea]

Description

This change allow multiple condition blocks to be defined in a listener rule

Motivation and Context

Resolves https://github.com/terraform-aws-modules/terraform-aws-alb/issues/347

Breaking Changes

No

How Has This Been Tested?

• [X] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [X] I have tested and validated these changes using one or more of the provided examples/* projects - planned but not applied due to not having a sandbox AWS account available
• [X] I have executed pre-commit run -a on my pull request

[bryantbiggs]

This is on my list for tomorrow

[antonbabenko]

This PR is included in version 9.8.0 :tada:

[github-actions[bot]]

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