Many of the utility methods in ScriptUtils are public only because they
were once invoked from JdbdTestUtils in spring-test, which is no longer
the case. Consequently, there should no longer be a need for any
external clients to invoke such methods.
To address this, this commit formally deprecates the following methods
in ScriptUtils in spring-jdbc.
- readScript(...)
- containsSqlScriptDelimiters(...)
- splitSqlScript(...)
Closes gh-26947