fix: add 21 plpgsql deparser edge case fixtures and fix 7 schema_rename failures #1033

Job	Run time
parser-tests (pgsql-deparser)	2m 18s
parser-tests (pgsql-parser)	1m 2s
parser-tests (@pgsql/quotes)	1m 2s
parser-tests (pg-proto-parser)	1m 13s
parser-tests (plpgsql-deparser)	1m 3s
parser-tests (plpgsql-parser)	1m 7s
parser-tests (@pgsql/transform)	5m 47s
	13m 32s

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