fix(plpgsql-deparser): fix failing fixtures - EXCEPTION blocks, schema qualification, implicit variables #929

Job	Run time
parser-tests (parser)	58s
parser-tests (proto-parser)	54s
parser-tests (deparser)	56s
parser-tests (plpgsql-deparser)	1m 5s
parser-tests (pgsql-cli)	54s
parser-tests (utils)	1m 0s
parser-tests (traverse)	59s
parser-tests (transform)	5m 40s
parser-tests (plpgsql-parser)	1m 9s
	13m 35s

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