Fix/bigquery job label length (#3703) (#3766)

* add blueprints to resolve issue

* revert to previous version

* intentionally failing test

* add imports

* add validation in existing function

* add passing test for length validation

* add current sanitized label

* remove duplicate var

* Make logging output 2 lines

Co-authored-by: Jeremy Cohen <jeremy@fishtownanalytics.com>

* Raise RuntimeException to better handle error

Co-authored-by: Jeremy Cohen <jeremy@fishtownanalytics.com>

* update test

* fix flake8 errors

* update changelog

Co-authored-by: Jeremy Cohen <jeremy@fishtownanalytics.com>

Co-authored-by: sungchun12 <sungwonchung3@gmail.com>

CHANGELOG.md

@@ -62,6 +62,7 @@ Contributors:
 ## dbt 0.20.2 (Release TBD)
 
 ### Under the hood
+
 - Switch to full reparse on partial parsing exceptions. Log and report exception information. ([#3725](https://github.com/dbt-labs/dbt/issues/3725), [#3733](https://github.com/dbt-labs/dbt/pull/3733))
 - Better error handling for BigQuery job labels that are too long. [#3703](https://github.com/dbt-labs/dbt/pull/3703)
 
@@ -70,8 +71,6 @@ Contributors:
 - Fix bug in finding analysis nodes when applying analysis patch ([#3764](https://github.com/dbt-labs/dbt/issues/3764), [#3767](https://github.com/dbt-labs/dbt/pull/3767))
 
 
-## dbt 0.20.1 (August 11, 2021)
-
 ## dbt 0.20.1rc1 (August 02, 2021)
 
 ### Features