DM-48445: Replace ScriptTemplates with Jinja Template

[tcjennings]

Removes ScriptTemplates from the application.

Does not deprecate or remove APIs related to ScriptTemplates, but eliminates the use of ScriptTemplates from both seed (example) files and script-generation functions and methods.

The concept of "script templates" is refactored using Jinja template files with "snippets" enabled or disabled based on configuration flags, e.g., "wms: htcondor" enables a template block that switches on the value of wms. In this way, a single template file can be considered, updated, and rendered according to the specific needs of a campaign instead of pulling in multiple template snippets from the database.

This pattern is also used in the process of writing a bash script to submit to htcondor for execution, with a simplified approach to setting up a "condor" or a "panda" stack environment and without the extra steps concerning clobbering and reimplementing environment variables in the shebang.