Potential fix for code scanning alert no. 59: Incomplete string escaping or encoding

[gkorland]

Potential fix for https://github.com/FalkorDB/QueryWeaver/security/code-scanning/59

To fix the problem, we need to ensure that both backslashes and single quotes are properly escaped in the string before embedding it in a JavaScript string literal. The best way is to first replace all backslashes (\) with double backslashes (\\), and then replace all single quotes (') with escaped single quotes (\'). This should be done in that order to avoid double-escaping. Ideally, this escaping should be encapsulated in a helper function for clarity and reuse. The fix should be applied to both instances where step.sql_query.replace(/'/g, "\\'") is used (lines 228 and 231). The helper function can be defined within the same file, above its first use.

Required changes:

• Add a helper function (e.g., escapeForSingleQuotedJsString) that escapes backslashes and single quotes.
• Replace both instances of step.sql_query.replace(/'/g, "\\'") with a call to this helper function.

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