Fix code scanning alert no. 24: Jinja2 templating with autoescape=False

[jordanpadams]

Fixes https://github.com/NASA-PDS/registry/security/code-scanning/24

To fix the problem, we need to ensure that the Jinja2 Environment object is created with autoescape enabled. This can be done by using the select_autoescape function, which will automatically enable autoescaping for specific file extensions like HTML and XML. This change will prevent XSS attacks by escaping any untrusted input rendered in the templates.

We need to modify the creation of the Environment object in the create_product_external and create_product_browse functions to include autoescape=select_autoescape(['html', 'xml']).

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