Intent of first_attempt_should_use_initial_backoff

All 9 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 9 tests
- server/ 9 tests
  - service/ 9 tests
    
    history/ 9 tests
    
    workflow/ 9 tests
    
    TestMutableStateRetryActivitySuite/ 3 tests
    
    go.temporal.io/server/service/history/workflow/TestMutableStateRetryActivitySuite/TestRetryActivity_should_be_scheduled_when_next_backoff_interval_can_be_calculated Inherited TestRetryActivity_should_clear_per_attempt_fields, TestRetryActivity_should_be_scheduled_when_next_backoff_interval_can_be_calculated
    
    go.temporal.io/server/service/history/workflow/TestMutableStateRetryActivitySuite/TestRetryActivity_should_clear_per_attempt_fields Inherited TestRetryActivity_should_clear_per_attempt_fields, TestRetryActivity_should_be_scheduled_when_next_backoff_interval_can_be_calculated
    
    go.temporal.io/server/service/history/workflow/TestMutableStateRetryActivitySuite/TestRetryActivity_when_task_can_not_be_generated_should_fail Inherited mutable_state_impl.go ×1
    
    Test_NonRetriableErrors/ 1 test
    
    go.temporal.io/server/service/history/workflow/Test_NonRetriableErrors/when_retriable_error_provided_should_proceed_to_calculate_backoff_interval Inherited when_retriable_error_provided_should_proceed_to_calculate_backoff_interval
    
    Test_nextBackoffInterval/ 5 tests
    
    go.temporal.io/server/service/history/workflow/Test_nextBackoffInterval/first_attempt_should_use_initial_backoff Introduced here
    
    go.temporal.io/server/service/history/workflow/Test_nextBackoffInterval/if_retry_exceeds_max_backoff_interval_should_set_it_to_max Inherited retry.go ×1
    
    go.temporal.io/server/service/history/workflow/Test_nextBackoffInterval/n-th_retry_should_be_initial_*_backoff^(n_-_1) Inherited n-th_retry_should_be_initial_*_backoff^(n_-_1)
    
    go.temporal.io/server/service/history/workflow/Test_nextBackoffInterval/negative_or_0_attempt_should_be_treated_as_first Inherited retry.go ×1
    
    go.temporal.io/server/service/history/workflow/Test_nextBackoffInterval/when_max_attempts_is_set_to_0_should_keep_trying Inherited when_max_attempts_is_set_to_0_should_keep_trying