BigQuery: Remaining procedural statements

[tunetheweb]

Brief summary of the change made

Fixes #3461

Are there any other side effects of this change that we should be aware of?

No, but similar to previous nested statements with similar end blocks are not supported until #3345 is addressed

Pull Request checklist

• Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.
  • .sql/.yml parser test cases in test/fixtures/dialects (note YML files can be auto generated with tox -e generate-fixture-yml).
  • Full autofix test cases in test/fixtures/linter/autofix.
  • Other.

• Added appropriate documentation for the change.

• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[codecov]

Codecov Report

Merging #3473 (ec87ed6) into main (b347033) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##             main     #3473   +/-   ##
========================================
  Coverage   99.99%   100.00%           
========================================
  Files         171       171           
  Lines       12938     12979   +41     
========================================
+ Hits        12937     12979   +42     
+ Misses          1         0    -1     

Impacted Files	Coverage Δ
src/sqlfluff/dialects/dialect_bigquery_keywords.py	100.00% <ø> (ø)
src/sqlfluff/dialects/dialect_bigquery.py	100.00% <100.00%> (ø)
src/sqlfluff/core/config.py	100.00% <0.00%> (+0.30%)	⬆️

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