feat: uniform rendering of stack trace from failed DB operations

[paulbalandan]

Description
Resurrecting #9364

All DB drivers except SQL Server logs (with 'error' level) a full stack trace of any failed DB executions via the thrown exception. For SQL Server, the log only includes the message produced by sqlsrv_errors(). Moreover, there's inconsistency with regard to Postgre and OCI8 drivers. Since pg_query() and oci8_execute() only throws because of our error handler, the stack trace also includes the error handler (the [internal function] stack).

This PR aims to make consistent the log output of these drivers by using the same trace rendering. This is already achieved by the private Exceptions::renderBacktrace() method for the thrown exceptions, so this PR extracts it to a new function render_backtrace() and uses that to format the trace. Also, trace coming from the error handler are removed.

For more discussion, refer to previous PR. Hope this passes now.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[paulbalandan]

Gemini told me testing $e->getMessage()directly is unreliable as the underlying PHP-C bridge can be different across machines. I'll fix this later.