views: add cloud view

[bschaatsbergen]

Closes #35159

The cloud backend implements a retry mechanism for its client, go-tfe. Currently, retry messages from this logic were not rendered through a view, so the -json flag was not respected. This resulted in mixed (non-pure JSON) output in the terminal whenever retry messages were printed.

This PR introduces a new view: cloud, which handles rendering output in human-readable or machine-readable format from cloud-specific operations.

The PR works around the current lack of native support for views in the backends. To work around this limitation, we have introduced a ViewType field in the CLI options, which we are now passing down the to the cloud backend.

 $ go test -run "TestNewCloud" -v
=== RUN   TestNewCloudHuman_RetryLog
=== RUN   TestNewCloudHuman_RetryLog/first_retry,_no_output
=== RUN   TestNewCloudHuman_RetryLog/second_retry,_server_error
=== RUN   TestNewCloudHuman_RetryLog/subsequent_retry_with_elapsed_time
=== RUN   TestNewCloudHuman_RetryLog/retry_with_429_status,_no_output
--- PASS: TestNewCloudHuman_RetryLog (0.00s)
    --- PASS: TestNewCloudHuman_RetryLog/first_retry,_no_output (0.00s)
    --- PASS: TestNewCloudHuman_RetryLog/second_retry,_server_error (0.00s)
    --- PASS: TestNewCloudHuman_RetryLog/subsequent_retry_with_elapsed_time (0.00s)
    --- PASS: TestNewCloudHuman_RetryLog/retry_with_429_status,_no_output (0.00s)
=== RUN   TestNewCloud_unsupportedViewDiagnostics
--- PASS: TestNewCloud_unsupportedViewDiagnostics (0.00s)
=== RUN   TestNewCloud_humanViewOutput
=== RUN   TestNewCloud_humanViewOutput/no_param
=== RUN   TestNewCloud_humanViewOutput/single_param
--- PASS: TestNewCloud_humanViewOutput (0.00s)
    --- PASS: TestNewCloud_humanViewOutput/no_param (0.00s)
    --- PASS: TestNewCloud_humanViewOutput/single_param (0.00s)
=== RUN   TestNewCloud_humanViewDiagnostics
--- PASS: TestNewCloud_humanViewDiagnostics (0.00s)
=== RUN   TestNewCloudJSON_RetryLog
=== RUN   TestNewCloudJSON_RetryLog/attempt_0,_no_output
=== RUN   TestNewCloudJSON_RetryLog/attempt_1,_server_error
=== RUN   TestNewCloudJSON_RetryLog/subsequent_retry_with_elapsed_time
=== RUN   TestNewCloudJSON_RetryLog/retry_with_429_status,_no_output
--- PASS: TestNewCloudJSON_RetryLog (0.00s)
    --- PASS: TestNewCloudJSON_RetryLog/attempt_0,_no_output (0.00s)
    --- PASS: TestNewCloudJSON_RetryLog/attempt_1,_server_error (0.00s)
    --- PASS: TestNewCloudJSON_RetryLog/subsequent_retry_with_elapsed_time (0.00s)
    --- PASS: TestNewCloudJSON_RetryLog/retry_with_429_status,_no_output (0.00s)
=== RUN   TestNewCloud_jsonViewOutput
=== RUN   TestNewCloud_jsonViewOutput/no_param
=== RUN   TestNewCloud_jsonViewOutput/single_param
--- PASS: TestNewCloud_jsonViewOutput (0.00s)
    --- PASS: TestNewCloud_jsonViewOutput/no_param (0.00s)
    --- PASS: TestNewCloud_jsonViewOutput/single_param (0.00s)
=== RUN   TestNewCloud_jsonViewDiagnostics
--- PASS: TestNewCloud_jsonViewDiagnostics (0.00s)
PASS
ok      github.com/hashicorp/terraform/internal/command/views   0.902s