Print log lines caught in buffer before raising

[jtcohen6]

see #2827

Describe the feature

https://github.com/fishtown-analytics/dbt/blob/72038258ed4b5cb7830734ffee3f43376075d9f3/core/dbt/logger.py#L459-L461

Change this code to rint the lines that would have overflowed the buffer before asserting.

• At 750 log lines: print to stdout
• At 1000 log lines: raise an exception

[github-actions]

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