fix: add 21 plpgsql deparser edge case fixtures and fix 7 schema_rename failures #1034

Job	Run time
parser-tests (plpgsql-parser)	1m 5s
parser-tests (pg-proto-parser)	1m 5s
parser-tests (pgsql-deparser)	2m 20s
parser-tests (pgsql-parser)	1m 4s
parser-tests (@pgsql/quotes)	1m 5s
parser-tests (plpgsql-deparser)	1m 7s
parser-tests (@pgsql/transform)	5m 56s
	13m 42s

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