Tweak to datatables column rendering

[PromoFaux]

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• I have made only one major change in my proposed changes.
• I have commented my proposed changes within the code.
• I have tested my proposed changes, and have included unit tests where possible.
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• I have squashed any insignificant commits. (git rebase)

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What does this PR aim to accomplish?:

Extends protections put in place to prevent arbitrary code values in columns from being evaluated/executed by forcing datatables to render them as text.

Blanket applied to all datatables declarations to use as the render method for all columns (unless otherwise specified) rather than the usages of the render.text() function being peppered about as it is currently.

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-ftl-v5-12-web-v5-9-and-core-v5-7-released/51795/1