Revert "Add test code to overwrite SQL in Beam Python JDBC (#30417)"

[Abacn]

This reverts commit 2b8a737.

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[Abacn]

Test failed:

test_xlang_jdbc_write_read_1_mysql (apache_beam.io.external.xlang_jdbcio_it_test.CrossLanguageJdbcIOTest) failed
sdks/python/pytest_postCommitIT-flink-py310.xml [took 57s]

ValueError: Type names and field names must be valid identifiers: 'count(*)'
a = (<apache_beam.io.external.xlang_jdbcio_it_test.CrossLanguageJdbcIOTest testMethod=test_xlang_jdbc_write_read_1_mysql>,)
kw = {}

    @wraps(func)
    def standalone_func(*a, **kw):
>       return func(*(a + p.args), **p.kwargs, **kw)

../../build/gradleenv/-1720702907/lib/python3.10/site-packages/parameterized/parameterized.py:620: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
apache_beam/io/external/xlang_jdbcio_it_test.py:220: in test_xlang_jdbc_write_read
    p

[Abacn]

It's close to release cut so revert the change and investigate later

[Abacn]

R: @jrmccluskey @damccorm

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[Abacn]

PreCommit Python failed unrelated change and fixed by #30540, merging for now