Formatting issue in eventarc golden files #16389

There is a formatting issue in the event arc golden files which was called out in googleapis/gapic-generator-python#1740 (comment)

https://github.com/googleapis/gapic-generator-python/blob/4eee26181e8db9fb5144eef5a76f178c1594e48a/tests/integration/goldens/eventarc/google/cloud/eventarc_v1/types/channel.py#L104-L107

There number of spaces between the words provider and wasn't is excessive.

The current parsing logic does not remove the extra spaces which appear in the source proto as a result of indenting subsequent lines in lists.

See source proto here: https://github.com/googleapis/googleapis/blob/eda81ef50cbc08ddf39e9e0689e116421581a234/google/cloud/eventarc/v1/channel.proto#L59C1-L64C28

The extra spaces added in the example below specifically for indentation of subsequent lines in lists is the cause of the formatting issue.

    // The INACTIVE state indicates that the Channel cannot receive events
    // permanently. There are two possible cases this state can happen:
    //
    // 1. The SaaS provider disconnected from this Channel.
    // 2. The Channel activation token has expired but the SaaS provider
    //    wasn't connected.

The following correction in the source protos would not result in a gap in the generated output.

    // The INACTIVE state indicates that the Channel cannot receive events
    // permanently. There are two possible cases this state can happen:
    //
    // 1. The SaaS provider disconnected from this Channel.
    // 2. The Channel activation token has expired but the SaaS provider
    // wasn't connected.

We can fix this problem by completing one or more of the following

• Update the source proto for event arc to remove indentation for subsequent lines in lists
• Updating AIPs and linter rule to prevent indentation for subsequent lines in lists
• Update the proto documentation parsing logic to remove the extra spaces which can be introduced due to the indentation of subsequent lines in lists.