test: enable PG regress test strings.sql

[lmatz]

Check https://github.com/risingwavelabs/risingwave/tree/main/src/tests/regress to see how we enable the test case

[lmatz]

Since #6355 and #6426, and this issue contains many test cases involving bytea, may use them to validate the implementation @BowenXiao1999

Probably just hex first, as you see fit

[BowenXiao1999]

Added some modified test from:

risingwave/src/tests/regress/data/sql/strings.sql

Line 69 in b804479

SELECT E'\\xDeAdBeEf'::bytea;

in the first pr of #6426

[github-actions]

This issue has been open for 60 days with no activity. Could you please update the status? Feel free to continue discussion or close as not planned.

[lmatz]

#8952