feat(jinja): add b64decode/b64encode builtin filters (#5863) #3880

Job	Run time
changes	9s
test-dbt-versions (1.5)	1m 24s
test-dbt-versions (1.6)	1m 42s
test-dbt-versions (1.3)	1m 47s
test-dbt-versions (1.9)	1m 40s
test-dbt-versions (1.7)	1m 55s
test-dbt-versions (1.8)	1m 41s
test-dbt-versions (1.10)	1m 47s
test-dbt-versions (1.4)	1m 43s
test-vscode	-8s
test-vscode-e2e	-9s
ui-test	1m 20s
style-and-cicd-tests (3.13)	23m 6s
migration-test	1m 38s
doc-tests	40s
cicd-tests-windows	9m 58s
style-and-cicd-tests (3.9)	23m 56s
style-and-cicd-tests (3.10)	23m 48s
style-and-cicd-tests (3.11)	20m 53s
style-and-cicd-tests (3.12)	23m 53s
engine-tests-docker (duckdb)	1m 40s
engine-tests-docker (postgres)	2m 37s
engine-tests-docker (mssql)	1m 53s
engine-tests-docker (trino)	8m 20s
engine-tests-docker (risingwave)	2m 43s
engine-tests-docker (mysql)	1m 51s
engine-tests-docker (starrocks)	2m 32s
engine-tests-docker (spark)	5m 56s
engine-tests-docker (clickhouse)	2m 37s
ui-style	0s
engine-tests-cloud (clickhouse-cloud)	16m 5s
engine-tests-cloud (redshift)	10m 25s
engine-tests-cloud (gcp-postgres)	3m 12s
engine-tests-cloud (fabric)	4m 44s
engine-tests-cloud (snowflake)	9m 26s
engine-tests-cloud (databricks)	14m 27s
engine-tests-cloud (bigquery)	15m 13s
engine-tests-cloud (athena)	20m 55s
	4h 27m 19s

Provide feedback