[BUGFIX] Allow multiline comments in SqlReader

When using c-style multiline comments in the ext_tables.sql of an
extension, the SchemaMigrator would then ignore the subsequent
"CREATE TABLE" statement, because the SqlReader also read the multiline
comments into the statement array.
This patch fixes this behaviour.
Now the following comments are possible inside ext_tables.sql:

/*
 Some comment text
 more text
*/

/* Same line c-style comment */

/* More multiline
 comments */

CREATE TABLE table1 (
    header varchar(255) DEFAULT '' NOT NULL,
    bodytext text
);

Resolves: #89714
Releases: master, 9.5
Change-Id: I49e687215d0b42d6ca5416c687fdbc19b44d237d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63951


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>